Musnad Ahmad 33:807

'Affan narrated to us, Abu 'Awanah narrated to us, Abu Bishr narrated to us, Sulayman ibn Qays informed us, from Jabir ibn 'Abdullah, who said: "We slaughtered with the Messenger of Allah, may Allah bless him and grant him peace, on the day of al-Hudaybiyyah seventy camels; one camel [was shared] by seven [people]."