Musnad Ahmad 30:2369

Isma'il narrated to us, Layth narrated to us, from al-Hajjaj ibn 'Ubayd, from Ibrahim ibn Isma'il, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "Is one of you unable, when he has prayed, to move forward, or move backward, or to his right, or to his left?"