Musnad Ahmad 305:1

Ya'qub narrated to us, he said: My father narrated to me, from Ibn Ishaq, he said: Hisham ibn 'Urwah narrated to me, from his father, from 'Abdullah ibn 'Abdullah ibn Abi Umayyah al-Makhzumi, who said: "I saw the Messenger of Allah, may Allah bless him and grant him peace, praying in the house of Umm Salamah, the wife of the Prophet, may Allah bless him and grant him peace, in a single garment, having wrapped himself in it, with nothing else upon him."