Musnad Ahmad 30:2385

Isma'il narrated to us, he said: Hisham al-Dastawa'i informed us, he said: Yahya ibn Abi Kathir narrated to us, from 'Ikrimah, from Abu Hurayrah, he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "If one of you prays in a single garment, then let him cross its two ends over his shoulders."