Musnad Ahmad 30:712

Muhammad ibn Bakr narrated to us, Ibn Jurayj narrated to us, Ibn Shihab informed me, regarding the hadith of Abu Salamah ibn Abd al-Rahman, that Abu Hurayrah narrated: That the Messenger of Allah (peace and blessings of Allah be upon him) was asked: "May a man pray in a single garment?" He said: "Does every one of you have two garments?"