Musnad Ahmad 31:284

Waki’ narrated to us, Sufyan narrated to us, from Jabir, from Muhammad ibn Qurzah, from Abu Sa’id al-Khudri, who said: I bought a ram to offer as a sacrifice, but a wolf ran at it and took the tail. He said: So I asked the Prophet, peace and blessings of Allah be upon him, and he said: "Offer it as a sacrifice."