Musannaf Ibn Abi Shayba 3:809

Ahmad ibn Abdullah ibn Yunus narrated to us, he said: Ya'la ibn al-Harith al-Muharibi narrated to us, he said: I heard Ghaylan ibn Jami' say: Iyas ibn Salamah narrated to me, from the son of Ammar ibn Yasir, he said: My father said to me: The Messenger of Allah (peace and blessings of Allah be upon him) led us in prayer in a single garment, having wrapped himself in it.