Maliks Muwatta Book 20, Hadith Number 172.

Section : Sacrificial Animals in General.

Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say, “A woman in ihram should not comb her hair when she leaves ihram until she has cut some of the tresses of her hair, and if she has an animal for sacrifice with her she should not cut off any of her hair until the animal has been killed.”