Abu Juhaifa said he asked ‘Ali whether he had any instruction not contained in the Qur’an and he replied, “By Him who split the seed and created the soul, I have nothing but what is in the Qur’an, except understanding which a man is given regarding His Book and what is in the document.” He asked him what the document contained, and he replied, “Blood wit, the setting free of a prisoner, and that a Muslim should not be killed for an infidel.” Bukhari transmitted it.