LXXXVII. And now regarding thy question, "How is it that no records are to be found concerning the Prophets that have preceded Adam, the Father of Mankind, or of the kings that lived in the days of those Prophets?" Know thou that the absence of any reference to them is no proof that they did not actually exist. That no records concerning them are now available, should be attributed to their extreme remoteness, as well as to the vast changes which the earth hath undergone since their time. (172:3)
Moreover such forms and modes of writing as are now current amongst men were unknown to the generations that were before Adam. There was even a time when men were wholly ignorant of the art of writing, and had adopted a system entirely different from the one which they now use. For a proper exposition of this an elaborate explanation would be required.
Gleanings from Writings - Bahá'u'lláh