Musnad Ahmad 1153:1500

Muhammad ibn Ubayd narrated to us, Muhammad—meaning Ibn Ishaq—narrated to us, from Imran, from Abu Salamah, from Aisha, who said: Safiyyah bint Huyayy menstruated while she was with the Messenger of Allah, peace and blessings of Allah be upon him, at Mina, after she had performed the Ifadah (Tawaf al-Ifadah). She said: When it was the day of departure (Yawm al-Nafr), this was mentioned to the Messenger of Allah, peace and blessings of Allah be upon him. He said: "Perhaps she will detain us." It was said: "O Messenger of Allah, she had already performed Tawaf around the House." He said: "Then let her depart."