Musnad Ahmad 33:928

Muhammad ibn Bakr and Rawh narrated to us, they said: Ibn Jurayj narrated to us, Abu al-Zubayr informed me that he heard Jabir ibn Abdullah narrating about the Hajj of the Prophet, peace and blessings of Allah be upon him. He said: "The Prophet, peace and blessings of Allah be upon him, commanded us, when we exited the state of Ihram, to offer a sacrificial animal (hadi), and that a group of us should join together in the sacrificial animal. That was when he commanded them to exit the state of Ihram from their Hajj."