Musnad Ahmad 305:2

Husayn ibn Muhammad narrated to us, he said: Ibn Abi al-Zinad narrated to us, from his father, from Urwah ibn al-Zubayr, that he said: Abdullah ibn Abi Umayyah informed me that he saw the Messenger of Allah, may Allah bless him and grant him peace, praying in the house of Umm Salamah in a garment, wrapping himself in it, crossing its two ends over his shoulders.