Musnad Ahmad 482:55

Hajjaj narrated to us, Layth ibn Sa'd narrated to us, Yazid ibn Abi Habib narrated to me, from Abu al-Khayr, from Uqbah ibn Amir: That the Messenger of Allah (peace and blessings of Allah be upon him) gave him some sheep, and he distributed them among his companions as sacrifices. A young goat (atud) remained from them, so he mentioned it to the Messenger of Allah (peace and blessings of Allah be upon him). He said: "Sacrifice it."