Musnad Ahmad 32:2044

'Affan narrated to us, Hammad ibn Salamah narrated to us, he said: Humayd informed us, from al-Hasan, and from Anas—according to what Hammad reckons—that the Messenger of Allah (ﷺ) went out 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.