Musannaf Ibn Abi Shayba 36:25

'Abd al-A'la narrated to us, from Dawud, from 'Ikrimah, regarding His saying: "O you who are wrapped in your mantle (al-muddaththir)," he said: "You have been covered with this matter, so arise and perform it." And regarding His saying: "O you who are wrapped in garments (al-muzzammil)," he said: "You have been wrapped with this matter, so arise and perform it."