Sunan An-Nasa'i

It was narrated that Ash-Sha'bi said:""I heard Abu Juhaifah say: 'We asked 'Ali: ""Do you have anything from the Messenger of Allah apart from the Qur'an?"" He said: ""No, by the One who splits the seeds and creates the soul, unless Allah gives a slave understanding of His Book, or except this sheet."" I said: ""What is in the sheet?"" He said: ""In it are (the regulations concerning) blood money and the freeing of captives and (the rule) that no Muslim should be killed for killing a disbeliever