Musannaf Ibn Abi Shayba 33:1222

Abu Usama narrated to us, he said: Al-A'mash narrated to us, from Mujahid, who said: There was a family in Medina who were in need, and they had the head of a sheep. They obtained something [else to eat], so they said: "If only we sent this head to someone who is in greater need of it than we are." He said: So they sent it away, and it continued to circulate in Medina until it returned to its original owners from whom it had departed.