Abu Dawud Book 9, Hadith Number 2821.
Chapter : On slaughtering the embryo.
Narated By Abu Sa’id al-Khudri : I asked the Apostle of Allah (PBUH) about the embryo. He replied: Eat it if you wish.
Musaddad’s version says: we said: Apostle of Allah, we slaughter a she-camel, a cow and a sheep, and we find an embryo in its womb. Shall we throw it away or eat it? He replied: Eat it if you wish for the slaughter of its mother serves its slaughter.