Bulugh al-Maram:Food:Hadith 1549
وَعَنْ جَابِرِ بنِ عَبْدِ اَللَّهِ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { نَحَرْنَا مَعَ اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-عَامَ اَلْحُدَيْبِيَةِ: اَلْبَدَنَةَ عَنْ سَبْعَةٍ, وَالْبَقَرَةَ عَنْ سَبْعَةٍ } رَوَاهُ مُسْلِم ٌ (1776)‏ .‏‏4 ‏- صحيح.‏ رواه مسلم ( 1318 )‏.‏

Jabir (RAA) narrated, ‘In the year of Hudaibiyah (Reconciliation), we sacrificed a camel for each seven people along with Allah’s Messenger (ﷺ), and also a cow for seven. ‘Related by Muslim.