Musnad Ahmad 32:1758

'Affan narrated to us, Hammad ibn Salamah narrated to us, he said: Humayd informed us, from al-Hasan, and from Anas—as Humayd reckons—that the Messenger of Allah (may Allah bless him and grant him peace) went out while he was leaning upon Usamah ibn Zayd, and he was wrapped in a cotton garment, having crossed its two ends over his shoulders, and he prayed with the people.