Maliks Muwatta Book 20, Hadith Number 188.
Yahya related to me from Malik that Yahya ibn Said said that Amra bint Abd ar-Rahman told him that she had heard A’isha, umm al-muminin, saying, “We set out with the Messenger of Allah, may Allah bless him and grant him peace, when there were five nights left in Dhu’l-Qada and we assumed that we must be setting out for hajj. When we got near to Makka, the Messenger of Allah, may Allah bless him and grant him peace, told everyone that did not have a sacrificial animal with them to leave ihram after they had done tawaf of the House and say between Safa and Marwa.”
A’isha added, “We were sent some beef on the day of sacrifice. I asked what it was and they said that the Messenger of Allah, may Allah bless him and grant him peace, had sacrificed for his wives.”
Yahya ibn Said said, “I mentioned this hadith to Qasim ibn Muhammad and he said, ‘She has given you the complete hadith, by Allah.'”