There are ten parts in blessedness. Nine-tenths are in commerce and the next one-tenth is in the skin.”The compiler of the book - may God be pleased with him - asked, “What is meant here by the skin is the skin of sheep. This is certified by another narration which has been cited on the authority of God’s Prophet who said, ‘The nine portions of one’s sustenance comes from commerce and the last part is in the skin - that is the skin of sheep.’”