Question: How can Adam be a Prophet when there was no books before?
Answer: ” It is well-known that it was revealed to him with what to worship Allah, Exalted with and likewise his sons. So he was a Messenger to his children. They did not know what to worship Allah with except through his path”
[Sharh Arba’een an-Nawawiyyah no. 4]
Translated by
Faisal Ibn Abdul Qaadir Ibn Hassan
Abu Sulaymaan