Musnad Ahmad 33:283

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, drove seventy camels for sacrifice in the year of Al-Hudaybiyah." He said: "And he slaughtered one camel on behalf of seven people."