Musaddad's version says: we said: Messenger 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.
In-book : Book 16, Hadith 40
English translation : Book 15, Hadith 2821