Bible

And should they reply: "The Books that are in the hands of this people, which they call the Gospel and attribute to Jesus, the Son of Mary, have not been revealed by God and proceed not from the Manifestations of His Self", then this would imply a cessation in the abounding grace of Him Who is the Source of all grace. If so, God's testimony to His servants would have remained incomplete and His favour proven imperfect. His mercy would not have shone resplendent, nor would His grace have overshadowed all. For if at the ascension of Jesus His Book had likewise ascended unto heaven, then how could God reprove and chastise the people on the Day of Resurrection, as hath been written by the Imams of the Faith and affirmed by its illustrious divines?

Bahá’u’lláh, Gems of Divine Mysteries, p. 12-13

Know verily that the purpose underlying all these symbolic terms and abstruse allusions, which emanate from the Revealers of God's holy Cause, hath been to test and prove the peoples of the world; that thereby the earth of the pure and illuminated hearts may be known from the perishable and barren soil. From time immemorial such hath been the way of God amidst His creatures, and to this testify the records of the sacred books.

Bahá’u’lláh, Kitab-i-Iqan, p. 49

Mention hath been made in certain books of a deluge which caused all that existed on earth, historical records as well as other things, to be destroyed. Moreover, many cataclysms have occurred which have effaced the traces of many events. Furthermore, among existing historical records differences are to be found, and each of the various peoples of the world hath its own account of the age of the earth and of its history. Some trace their history as far back as eight thousand years, others as far as twelve thousand years. To any one that hath read the book of Juk it is clear and evident how much the accounts given by the various books have differed. Please God thou wilt turn thine eyes towards the Most Great Revelation, and entirely disregard these conflicting tales and traditions.

Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, 2nd. ed., p. 174-175

The Four Gospels were written after Him [Christ]. John, Luke, Mark and Matthew - these four wrote after Christ what they remembered of His utterances.

Bahá’u’lláh, from a previously untranslated Tablet, Extracts From The Bahá’í Writings And From Letters Of The Guardian And The Universal House Of Justice On The Old And New Testaments

The disciples of Christ taught His Faith with the language of the Kingdom. That language conformeth to all languages, for it consisteth of celestial meanings and divine mysteries. For the one who becometh conversant with that language the realities and secrets of creation stand unveiled before him. Divine truths are common to all languages. The Holy Spirit, therefore, taught the disciples the language of the Kingdom, and they thus were able to converse with the people of all nations. Whenever they spoke to those of other nations of the world, it was as if they conversed in their tongues. The well-known and outstanding languages of the world number about a thousand. It was necessary for the disciples to have written the Gospels in at least one of the languages of other nations. Thus, as it is known, the Gospels were written only in Hebrew and Greek, and not even in the language of the Romans, although it was at the time the official language. As the disciples were not well-versed in it, the Gospels were not written in that language.

‘Abdu’l-Bahá, from a previously untranslated Tablet, Extracts From The Bahá’í Writings And From Letters Of The Guardian And The Universal House Of Justice On The Old And New Testaments

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", p. 109