Musnad Ahmad 30:705

Ibrahim ibn Khalid narrated to us, Rabah narrated to us, from Ma'mar, from al-Zuhri, Sa'id ibn al-Musayyib narrated to me, from Abu Hurairah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, there is an hour on Friday; no Muslim servant coincides with it while asking Allah for something, except that He gives it to him."