Musnad Abu Ya'la al-Mawsili 109:244

Abu Khaythama narrated to us, Rawh narrated to us, Zakariyya narrated to us, 'Amr ibn Dinar narrated to us, he said: I heard Jabir ibn 'Abd Allah narrating that the Messenger of Allah (may Allah bless him and grant him peace) was carrying stones with them for the Ka'bah, and he was wearing his lower garment (izar). His uncle al-'Abbas said to him, "O son of my brother, if you were to loosen your lower garment and place it on your shoulder beneath the stones." He said: So he loosened it and placed it on his shoulder. He said: Then he fell unconscious. He said: And he was never seen naked after that day.