Abu Dawud
Sacrifice
Book Number: 009 / Hadith Number: 2782
Narated By Mikhnaf ibn Sulaym : We were staying with the Apostle of Allah (pbuh) at Arafat; he said: O people, every family must offer a sacrifice and an atirah. Do you know what the atirah is? It is what you call the Rajab sacrifice.
Abu Dawud said: 'Atriah has been abrogated, and this tradition is an abrogated one.