صحيح البخاري

Narrated Mu`adh bin Sa`d or Sa`d bin Mu`adh:

A slave girl belonging to Ka`b used to graze some sheep at Sl'a (mountain). Once one of her sheep was dying. She reached it (before it died) and slaughtered it with a stone. The Prophet (ﷺ) was asked, and he said, "Eat it."