Maliks Muwatta Book 20, Hadith Number 155.

Section : What to Do with Sacrificial Animals (Hadys) if They get Injured or Stray.

Yahya related to me from Malik from Ibn Shihab that Said ibn al-Musayyab said, “If someone dedicates an animal voluntarily and then it is injured and he kills it and gives everyone a free hand in eating it, he owes nothing. If, however, he eats some of it himself, or tells certain other people to eat it, then he owes compensation.”