Hadith 8:152
Abu Bakr narrated to us, he said: Ya'la and Ibn Numayr narrated to us, from 'Abd al-Malik, from 'Ata', from Jabir, he said: We used to perform Tamattu' with the Messenger of Allah, may Allah bless him and grant him peace, and he would slaughter a cow on behalf of seven people.
حدثنا أبو بكر قال ثنا يعلى وبن نمير عن عبد الملك عن عطاء عن جابر قال كنا نتمتع مع رسول الله صلى الله عليه وسلم فيذبح البقرة عن سبعة