It was narrated that Tariq - i.e., bin Shihab - said:
I heard ` Ali (رضي الله عنه) say: We do not have any book that we read to you except what is in the Qur`an and what is in this document - a document that was in the sheath of a sword that he was wearing, which had an adornment of iron. - I took it from the Messenger of Allah (ﷺ) and in it are the rates of zakah.