Three days after His crucifixion “the disciples became assured and steadfast, … began to serve the Cause of Christ” and as a result “the Reality of Christ became resplendent and His bounty appeared”

...The Cause of Christ was like a lifeless body; and when after three days the disciples became assured and steadfast, and began to serve the Cause of Christ, and resolved to spread the divine teachings, putting His counsels into practice, and arising to serve Him, the Reality of Christ became resplendent and His bounty appeared; His religion found life; His teachings and His admonitions became evident and visible. In other words, the Cause of Christ was like a lifeless body until the life and the bounty of the Holy Spirit surrounded it.

Such is the meaning of the resurrection of Christ, and this was a true resurrection....
- ‘Abdu’l-Baha  (‘Some Answered Questions')

Meeting of Christ with the apostles after His crucifixion

...Thou hast written concerning the meeting of His Highness Christ after the crucifixion and that some of the apostles perceived Him but did not recognize Him; but that they did recognize Him after the breaking of bread.

Know thou that the Messianic Spirit and the outpouring of the Holy Spirit is always manifest, but capacity and ability (to receive it) is more in some and less in others. After the crucifixion the apostles had not in the beginning the capacity and ability of witnessing the Messianic reality. For they were agitated. But when they found firmness and steadfastness, their inner sight became opened, and they saw the reality of the Messiah as manifest. For the body of Christ was crucified and vanished, but the Spirit of Christ is always pouring upon the contingent world, and is manifest before the insight of the people of assurance. 
- ‘Abdu’l-Baha  (Tablets of Abdul-Baha, Vol. 1)

The version of the “heavenly Gospel” currently in existence is the “genuine text”

We have also heard a number of the foolish of the earth assert that the genuine text of the heavenly Gospel doth not exist amongst the Christians, that it hath ascended unto heaven. How grievously they have erred! How oblivious of the fact that such a statement imputeth the gravest injustice and tyranny to a gracious and loving Providence! 
- Baha’u’llah  ('The Book of Certitude')

Apostles were like "Letters" Christ was the "the essence of the Word Itself"

The Apostles of Christ were even as Letters, and Christ was the essence of the Word Itself; and the meaning of the Word, which is grace everlasting, cast a splendor on those Letters. Again, since the Letter is a member of the Word, it therefore, in its inner meaning, is consonant with the Word.” 
- ‘Abdu’l-Baha  ('Selections from the Writings of ‘Abdu’l-Baha')

General Baha’i attitude towards Christianity

As to the position of Christianity, let it be stated without any hesitation or equivocation that its Divine origin is unconditionally acknowledged, that the Sonship and Divinity of Jesus Christ are fearlessly asserted, that the Divine inspiration of the Gospel is fully recognized, that the reality of the mystery of the Immaculacy of the Virgin Mary is confessed, and the primacy of Peter, the Prince of the Apostles, is upheld and defended. 
- Shoghi Effendi  (The Promised Day is Come')

Baha’u’llah exalts the station of Jesus, His mother and Peter

The Founder of the Christian Faith is designated by Bahá'u'lláh as the "Spirit of God," is proclaimed as the One Who "appeared out of the breath of the Holy Ghost," and is even extolled as the "Essence of the Spirit." His mother is described as "that veiled and immortal, that most beauteous, countenance," and the station of her Son eulogized as a "station which hath been exalted above the imaginings of all that dwell on earth," whilst Peter is recognized as one whom God has caused "the mysteries of wisdom and of utterance to flow out of his mouth." 
- Shoghi Effendi  ('The Promised Day is Come')

The effect of Jesus on the world

Know thou that when the Son of Man yielded up His breath to God, the whole creation wept with a great weeping. By sacrificing Himself, however, a fresh capacity was infused into all created things. Its evidences, as witnessed in all the peoples of the earth, are now manifest before thee. The deepest wisdom which the sages have uttered, the profoundest learning which any mind hath unfolded, the arts which the ablest hands have produced, the influence exerted by the most potent of rulers, are but manifestations of the quickening power released by His transcendent, His all-pervasive and resplendent Spirit. We testify that when He came into the world, He shed the splendor of His glory upon all created things. Through Him the leper recovered from the leprosy of perversity and ignorance. Through Him the unchaste and wayward were healed. Through His power, born of Almighty God, the eyes of the blind were opened and the soul of the sinner sanctified.... He it is Who purified the world. Blessed is the man who, with a face beaming with light, hath turned towards Him. 
- Baha’u’llah  (Quoted by Shoghi Effendi in 'The Promised Day is Come')

Resurrection of Jesus

We do not believe that there was a bodily resurrection after the crucifixion of Christ, but that there was a time after His ascension when His disciples perceived spiritually His true greatness and realized He was eternal in being. This is what has been reported symbolically in the New Testament and been misunderstood. His eating with His disciples after resurrection is the same thing. 
- Shoghi Effendi  (From a letter written on behalf of Shoghi Effendi, ‘High Endeavours - Messages to Alaska’)

Process through which the Kingdom promised by Christ will be established on earth

His [Baha’u’llah’s] purpose, far from belittling the station of the Prophets gone before Him or of whittling down their teachings, is to restate the basic truths which these teachings enshrine in a manner that would conform to the needs, and be in consonance with the capacity, and be applicable to the problems, the ills and perplexities, of the age in which we live. His mission is to proclaim that the ages of the infancy and of the childhood of the human race are past, that the convulsions associated with the present stage of its adolescence are slowly and painfully preparing it to attain the stage of manhood, and are heralding the approach of that Age of Ages when swords will be beaten into plowshares, when the Kingdom promised by Jesus Christ will have been established, and the peace of the planet definitely and permanently ensured. Nor does Bahá'u'lláh claim finality for His own Revelation, but rather stipulates that a fuller measure of the truth He has been commissioned by the Almighty to vouchsafe to humanity, at so critical a juncture in its fortunes, must needs be disclosed at future stages in the constant and limitless evolution of mankind. 
- Shoghi Effendi  ('Summary Statement - 1947, Special UN Committee on Palestine')

The miracle associated with the birth of Jesus

What science calls a virgin birth we do not associate with that of Jesus Christ, which we believe to have been a miracle and a sign of His Prophethood. In this matter we are in entire agreement with the most orthodox church views. 
- Shoghi Effendi  (From a letter written on behalf of Shoghi Effendi, ‘High Endeavours - Messages to Alaska’)

Baha’u’llah addresses a most weighty Epistle to Pope Pius IX

To Pope Pius IX, the undisputed head of the most powerful Church in Christendom, possessor of both temporal and spiritual authority, He, a Prisoner in the army barracks of the penal-colony of 'Akká, addressed a most weighty Epistle, in which He announces that "He Who is the Lord of Lords is come overshadowed with clouds," and that "the Word which the Son concealed is made manifest." He, moreover, warns him not to dispute with Him even as the Pharisees of old disputed with Jesus Christ; bids him leave his palaces unto such as desire them, "sell all the embellished ornaments" in his possession, "expend them in the path of God," abandon his kingdom unto the kings, "arise ... amidst the peoples of the earth," and summon them to His Faith. Regarding him as one of the suns of the heaven of God's names, He cautions him to guard himself lest "darkness spread its veils" over him; calls upon him to "exhort the kings" to "deal equitably with men"; and counsels him to walk in the footsteps of his Lord, and follow His example. 
- Shoghi Effendi  ('God Passes By')

Some references to ‘Akka (Acre), the prison city in Palestine (currently Israel) where Baha’u’llah was exiled in 1868

Akká, itself, flanked by the "glory of Lebanon," and lying in full view of the "splendor of Carmel," at the foot of the hills which enclose the home of Jesus Christ Himself, had been described by David as "the Strong City," designated by Hosea as "a door of hope," and alluded to by Ezekiel as "the gate that looketh towards the East," whereunto "the glory of the God of Israel came from the way of the East," His voice "like a noise of many waters." 
- Shoghi Effendi  ('God Passes By')

Baha’u’llah’s shrine is at Bahji, the property located north-east of the city of Acre. It is a place of pilgrimage for Baha’is worldwide and the point to which Baha'is turn in prayer.

Some references about Baha’u’llah by Christ and His Apostles

To Him Jesus Christ had referred as the "Prince of this world," as the "Comforter" Who will "reprove the world of sin, and of righteousness, and of judgment," as the "Spirit of Truth" Who "will guide you into all truth," Who "shall not speak of Himself, but whatsoever He shall hear, that shall He speak," as the "Lord of the Vineyard," and as the "Son of Man" Who "shall come in the glory of His Father" "in the clouds of heaven with power and great glory," with "all the holy angels" about Him, and "all nations" gathered before His throne. To Him the Author of the Apocalypse had alluded as the "Glory of God," as "Alpha and Omega," "the Beginning and the End," "the First and the Last." Identifying His Revelation with the "third woe," he, moreover, had extolled His Law as "a new heaven and a new earth," as the "Tabernacle of God," as the "Holy City," as the "New Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband." To His Day Jesus Christ Himself had referred as "the regeneration when the Son of Man shall sit in the throne of His glory." To the hour of His advent St. Paul had alluded as the hour of the "last trump," the "trump of God," whilst St. Peter had spoken of it as the "Day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat." His Day he, furthermore, had described as "the times of refreshing," "the times of restitution of all things, which God hath spoken by the mouth of all His holy Prophets since the world began." 
- Shoghi Effendi ('God Passes By')

The Báb was the “Return of John the Baptist”; He exhibited the “radiance of Jesus”

The Báb was “the ‘Qá'im’ (He Who ariseth) promised to the Shí'ahs, the ‘Mihdi’ (One Who is guided) awaited by the Sunnis, the ‘Return of John the Baptist’ expected by the Christians, the ‘Ushidar-Mah’ referred to in the Zoroastrian scriptures, the ‘Return of Elijah’ anticipated by the Jews, Whose Revelation was to show forth ‘the signs and tokens of all the Prophets’, Who was to ‘manifest the perfection of Moses, the radiance of Jesus and the patience of Job’ …” He was the ‘Second Woe,’ spoken of in the Apocalypse of St. John the Divine …” - Shoghi Effendi  ('God Passes By')

Fulfillment of the reference from the Revelation of St. John the Divine concerning the appearance of one of the two "Witnesses" into whom, ere the "second woe is past," the "spirit of life from God" must enter

Quddus, immortalized by Him as Ismu'llahi'l-Akhir (the Last Name of God); on whom Bahá'u'lláh's Tablet of Kullu't-Ta'am later conferred the sublime appellation of Nuqtiy-i-Ukhra (the Last Point); whom He elevated, in another Tablet, to a rank second to none except that of the Herald of His Revelation; whom He identifies, in still another Tablet, with one of the "Messengers charged with imposture" mentioned in the Qur'án; whom the Persian Bayan extolled as that fellow-pilgrim round whom mirrors to the number of eight Vahids revolve; on whose "detachment and the sincerity of whose devotion to God's will God prideth Himself amidst the Concourse on high;" whom 'Abdu'l-Bahá designated as the "Moon of Guidance;" and whose appearance the Revelation of St. John the Divine anticipated as one of the two "Witnesses" into whom, ere the "second woe is past," the "spirit of life from God" must enter -- such a man had, in the full bloom of his youth, suffered, in the Sabzih-Maydan of Barfurush, a death which even Jesus Christ, as attested by Bahá'u'lláh, had not faced in the hour of His greatest agony. 
- Shoghi Effendi  (God Passes By')

Explanations of specific passages in the Bible: Revelation: 12th chapter of Ecclesiastes

As to thy question concerning the 12th chapter of Ecclesiastes: This is prophecy regarding the coming of Jesus in that book, the signs and marks of which were fulfilled with the appearance of the Promised One of the Bible ["Bible" signifies the Old Testament; "Gospel" signifies the New Testament.]; but since the Jews did not understand the meaning thereof, so they denied Jesus and -- God forbid! -- said that He was the deformed (Antichrist). Then it is said by Jesus in the Gospel, that similar signs would appear in the "last day" -- or in other words -- in the day when Christ will come the second time in this world.

The interpretation of these statements is mentioned in the clearest manner and with the most wonderful proofs in the Book of Iqan. 
- ‘Abdu'l-Baha  (Tablets of Abdu'l-Baha vol. 1)

Explanation of Specific Passages in the Bible: Revelation: Chapter 21 verses 21 & 17

          
Thou hast asked in regard to the 10th verse of the 21st chapter of Revelation and to the 17th verse: Know that the firmament of the bright sun of the world of possibilities is divided into twelve sections, according to mathematical principles, which are called the twelve constellations; likewise, the Sun of Truth manifests and pours forth His bounty in twelve constellations of holiness. By these constellations are meant holy souls who are the manifestations of purity and the dawning-points of the lights of Unity. Observe that in the day of His Holiness the Speaker of God (Moses), there were twelve holy souls who were the leaders of the Truth. In like manner, in the cycle of His Holiness the Spirit (Jesus Christ), note that there were twelve apostles under the shadow of the light of the Most High, and the Sun of Truth was manifested through those bright dawning-places like unto the phenomenal sun. Likewise, in the time of His Holiness Mohammed, consider that there were twelve dawning points of holiness who were the manifestations of confirmation. Such is the case.

Not to measure the validity of divine religions by the behavior of those who claim to follow them

It is true that there are foolish individuals who have never properly examined the fundamentals of the Divine religions, who have taken as their criterion the behavior of a few religious hypocrites and measured all religious persons by that yardstick, and have on this account concluded that religions are an obstacle to progress, a divisive factor and a cause of malevolence and enmity among peoples. They have not even observed this much, that the principles of the Divine religions can hardly be evaluated by the acts of those who only claim to follow them. For every excellent thing, peerless though it may be, can still be diverted to the wrong ends. A lighted lamp in the hands of an ignorant child or of the blind will not dispel the surrounding darkness nor light up the house—it will set both the bearer and the house on fire. Can we, in such an instance, blame the lamp? No, by the Lord God! To the seeing, a lamp is a guide and will show him his path; but it is a disaster to the blind.

Among those who have repudiated religious faith was the Frenchman, Voltaire, who wrote a great number of books attacking the religions, works which are no better than children’s playthings. This individual, taking as his criterion the omissions and commissions of the Pope, the head of the Roman Catholic religion, and the intrigues and quarrels of the spiritual leaders of Christendom, opened his mouth and caviled at the Spirit of God (Jesus). In the unsoundness of his reasoning, he failed to grasp the true significance of the sacred Scriptures, took exception to certain portions of the revealed Texts and dwelt on the difficulties involved. 
- 'Abdu'l-Baha  ('Secret of Divine Civilization')

Meaning of Symbols & Parables in the Bible: Christ’s Resurrection

Question: -- What is the meaning of Christ's resurrection after three days?

Answer: -- The resurrections of the Divine Manifestations are not of the body. All Their states, Their conditions, Their acts, the things They have established, Their teachings, Their expressions, Their parables and Their instructions have a spiritual and divine signification, and have no connection with material things. For example, there is the subject of Christ's coming from heaven: it is clearly stated in many places in the Gospel that the Son of man came from heaven, He is in heaven, and He will go to heaven. So in chapter 6, verse 38, of the Gospel of John it is written: "For I came down from heaven"; and also in verse 42 we find: "And they said, Is not this Jesus, the son of Joseph, whose father and mother we know? How is it then that he saith, I came down from heaven?" Also in John, chapter 3, verse 13: "And no man hath ascended up to heaven, but He that came down from heaven, even the Son of man which is in heaven."

Meaning of Symbols & Parables in the Bible: Baptism & why Christ needed to be baptized by John the Baptist?

Question.:-- It is said in the Gospel of St. Matthew, chapter 3, verses 13, 14, 15: "Then cometh Jesus from Galilee to Jordan unto John, to be baptized of him. But John forbade Him, saying, I have need to be baptized of Thee, and comest Thou to me? And Jesus answering said unto him, Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered Him." What is the wisdom of this: since Christ possessed all essential perfection, why did He need baptism?

Answer: -- The principle of baptism is purification by repentance. John admonished and exhorted the people, and caused them to repent; then he baptized them. Therefore, it is apparent that this baptism is a symbol of repentance from all sin: its meaning is expressed in these words: "O God! as my body has become purified and cleansed from physical impurities, in the same way purify and sanctify my spirit from the impurities of the world of nature, which are not worthy of the Threshold of Thy Unity!" Repentance is the return from disobedience to obedience. Man, after remoteness and deprivation from God, repents and undergoes purification: and this is a symbol signifying "O God! make my heart good and pure, freed and sanctified from all save Thy love."