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.

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."

Yahya related to me from Malik from Hisham ibn Urwa that his father used to kill his sacrificial animals while they were standing.

Malik said, "No-one is permitted to shave his head until he has killed his sacrificial animal, and no-one must sacrifice before dawn on the day of sacrifice. The things that should be done on the day of sacrifice are slaughtering, donning clothes, grooming the body generally (at-tafath) and shaving the head, and none of this may be done before the day of sacrifice."