Kathir bin Abdullah bin Amr bin Awf Al-Muzani narrated from his father, from his grandfather, that :the Prophet said: "On Friday there is an hour in which the worshipper does not ask Allah for anything except that Allah grants it to him." They said: "O Messenger of Allah! Which hour is it?" He said: "When the prayer is begun until it is finished

English translation · Jami' at-Tirmidhi