The Book of ad-Dahaya (Sacrifices)
43/16. Chapter:
What Is Equivalent To A Cow For Sacrifice
Sunan an-Nasai
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 .
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 )
Reference : Sunan an-Nasa'i 4393In-book reference : Book 43, Hadith 33English translation : Vol. 5, Book 43, Hadith 4398