Musnad Ahmad 1153:1926

Ibn Numayr narrated to us, from Hisham, from his father, from Aisha, who said: The Prophet, peace and blessings of Allah be upon him, mentioned Safiyyah, and it was said: "She is menstruating." He said: "Perhaps she will detain us?" It was said: "O Messenger of Allah, she has already performed the Ifadah (Tawaf al-Ifadah)." He said: "Then no [she will not detain us]."