Musnad Ahmad 30:2764

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Muhammad ibn Ziyad, he said: I heard Abu Hurairah, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, there is an hour in Friday; no Muslim servant coincides with it while praying, asking Allah the Mighty and Majestic for good, but He will give it to him."