(62) باب الاِشْتِرَاكِ فِي الْهَدْىِ وَإِجْزَاءِ الْبَقَرَةِ وَالْبَدَنَةِ كُلٍّ مِنْهُمَا عَنْ سَبْعَةٍ
Jabir (Allah be pleased with him) reported:
We set out in the state of Ihram for Hajj along, with Allah's Messenger (ﷺ). He commanded us that seven persons should join in a camel and a cow for offering sacrifice.
Reference: Sahih Muslim 1318 b
In-book reference: Book 15, Hadith 390
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 3025