Musnad Ahmad 27:1243

Abu Ahmad al-Zubayri narrated to us, Sufyan narrated to us, from Abdullah—meaning Ibn Aqil—from Ibn Umar, that the Prophet (peace and blessings of Allah be upon him) clothed him in a *sayra'* garment, and he clothed Usamah in two Coptic garments. Then he said: "Whatever touches the ground is in the Fire."