it wasnarrated that Ibn 'Abbas said:
"We were with the Messenger ofAllah (ﷺ) on a journey, and the (day of) Al-Adha came. We(sacrificed) one camel on behalf of ten (people) and one cow onbehalfof seven." (RU)
English reference (RU): Vol. 4, Book 26, Hadith 3131 (RU)
Arabic reference (RU): Book 26, Hadith 3251 (RU)