"And even if We had sent down unto you a writing on parchment," the verse. Al-Hasan said: This is because they asked the Messenger of Allah, peace be upon him, to bring them a sign: a book that they could read. They said: We will not believe you until you send down to us a book from Allah that we can read, addressed to every man by his name, stating: Believe in Muhammad, for he is My messenger.

Surat al-An'am from verse (8) to verse (10).