Musnad Ahmad 30:354

Yazid ibn Harun narrated to us, Ibn 'Awn informed us, from Muhammad, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him), who said: "Indeed, in Friday there is an hour"—and Ibn 'Awn began to show us with his right hand, and we said: "He is making it short"—"no Muslim man happens upon it while standing, praying, asking Allah for good, but that He gives it to him."