Musnad Ahmad 482:89

Waki' narrated to us, from Usamah bin Zayd, from Mu'adh bin 'Abdullah bin Khubayb, from Ibn al-Musayyib, from 'Uqbah bin 'Amir, who said: I asked the Messenger of Allah, peace and blessings of Allah be upon him, about the *jadha'* (a lamb in its first year). He said: "Sacrifice it, for there is no harm in it."