Muwatta Malik #972

Yahya related to me from Malik from Abdullah ibn Abi Bakr ibn Hazm from his father from Amra bint Abd ar-Rahman that A'isha umm al- muminin said to the Messenger of Allah, may Allah bless him and grant him peace, "Messenger of Allah, Safiyya bint Huyy has begun her period," and the Messenger of Allah, may Allah bless him and grant him peace, said, "Perhaps she will delay us. Has she done tawaf of the House with you?" They said, "Of course." He said, "So you are free to leave."