We used to perform tamattu pilgrimage with the Prophet ﷺ, and we would slaughter a cow on behalf of seven people, sharing in it together.
حدثنا يحيى عن عبد الملك عن عطاء
كنا نتمتع مع النبي ﷺ فنذبح البقرة عن سبع نشترك فيها
Its isnad is sahih, it was mentioned earlier at 14335.