Musnad Abu Ya'la al-Mawsili 42:278

Zuhayr narrated to us, Yahya ibn Hammad narrated to us, Abu 'Awanah narrated to us, from al-A'mash, Abu Sufyan narrated to us, from Jabir ibn 'Abd Allah, he said: Abu Sa'id al-Khudri narrated to me that he entered upon the Prophet, may Allah bless him and grant him peace, and saw him praying in a single garment, having wrapped himself in it.