Musnad Ahmad 30:651

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Muhammad ibn Ziyad, from Abu Hurayrah, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, while he was on the pulpit, saying: "Indeed, there is an hour in Friday—and he gestured with his hand, as if to minimize it—no Muslim servant coincides with it while asking Allah for something, except that He gives it to him."