Sunan an-Nasa'i, Volume 5, Book 43, Hadith 4398 (DarusSalam) ⓘ
It was narrated that Jabir said: "We would make Tamattu' when the Prophet was with us, and we would sacrifice a cow on behalf of seven people, sharing it among ourselves." (Sahih )
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، عَنْ يَحْيَى، عَنْ عَبْدِ الْمَلِكِ، عَنْ عَطَاءٍ، عَنْ جَابِرٍ، قَالَ كُنَّا نَتَمَتَّعُ مَعَ النَّبِيِّ صلى الله عليه وسلم فَنَذْبَحُ الْبَقَرَةَ عَنْ سَبْعَةٍ وَنَشْتَرِكُ فِيهَا .
also referenced under: Hadith 4393 (Reference) & Book 43, Hadith 33 (In-Book)