1. A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr from al-Kahiliy who has said the following: “Once a man asked abu ‘ Abd Allah عليه السلام, when I was with him (the Imam), about the tails of sheep being cut off. He (the Imam) said, ’It is not unlawful if it serves your interest. 5 He (the Imam) then said, ’It is in the book of Ali عليه السلام, that whatever is cut off from sheep, is dead and must not be used to benefit thereby.’”