Musnad Ahmad 482:133

'Abd al-Wahhab ibn 'Ata narrated to us, Hisham informed us, from Yahya, from Ba'jah al-Juhani, from 'Uqbah ibn 'Amir al-Juhani, who said: The Messenger of Allah (may Allah bless him and grant him peace) distributed sacrificial animals among his companions, and a *jadha'ah* (a young sheep) fell to 'Uqbah. He said: So I said, "O Messenger of Allah, a *jadha'ah* has fallen to me." He said: "Sacrifice it."