Musnad Ahmad 1153:1424

He said: I read to Abd al-Rahman: Malik, from Abdullah ibn Abi Bakr, from his father, from Amrah bint Abd al-Rahman, from Aisha, that she said to the Messenger of Allah, may Allah bless him and grant him peace: "Safiyyah bint Huyayy has menstruated." The Messenger of Allah, may Allah bless him and grant him peace, said: "Perhaps she will detain us. Did she not perform the circumambulation (tawaf) of the House with you?" They said: "Yes." He said: "Then depart."