it was narrated that Ibn ‘Abbas said: “We were with the Messenger of Allah (ﷺ) on a journey, and the (day of) Al-Adha came. We (sacrificed) one camel on behalf of ten (people) and one cow on behalf of seven.”
SahihSahihHasanBook 26 · Hadith 12
سنن ابن ماجه
it was narrated that Ibn ‘Abbas said: “We were with the Messenger of Allah (ﷺ) on a journey, and the (day of) Al-Adha came. We (sacrificed) one camel on behalf of ten (people) and one cow on behalf of seven.”