190 Yahya related to me from Malik from Jafar ibn Muhammad from his father from Ali ibn Abi Talib that the Messenger of Allah, may Allah bless him and grant him peace, killed some of his sacrificial animals himself, and someone else killed the rest.
Muwatta Malik Book 20, Hadith 193
← Previous Hadith Yahya related to me from Malik from Nafi from Abdullah ibn Umar that Hafsa, umm al-muminin, once said to the Messenger of Allah, may Allah bless him and grant him peace, "Why is it that everyone has left ihram and you still have not left ihram from your umra?" and he replied, "I have matted my hair and garlanded my sacrificial animal and will not leave ihram until I have sacrificed the animal."

Muwatta Malik Book 20, Hadith 192 Next Hadith → Yahya related to me from Malik from Nafi that Abdullah ibn Umar said, "Someone who vows to sacrifice a camel or a cow to Allah should garland it with two sandals about its neck, and brand it by causing blood to flow from its side. He should then sacrifice it either at the House or at Mina on the day of sacrifice. There are no other correct places apart from those. However, someone who vows to slaughter a camel or a cow simply as a sacrifice can sacrifice it wherever he wishes."

Muwatta Malik Book 20, Hadith 194