It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him); he said: The Companions said: "O Messenger of Allah, what are these sacrifices?" He said: "The Sunnah of your father Ibrahim (peace be upon him)." They said: "What reward is there for us in them?" He said: "For every hair, a good deed." They said: "And what about the wool?" He said: "For every hair of it too, a good deed."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5056