Sahih Bukhari
Hunting, Slaughtering
Volume: 007 / Book Number: 067 / Hadith Number: 413
Narrated Mu'adh bin Sad or Sad 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 was asked, and he said, "Eat it."