Sunan Ibn Majah, Chapter: The Chapters of Establishing the Prayer and the Sunnah Regarding Them

"I said, when the Messenger of Allah (saw) was sitting: 'We find in the Book of Allah that on Friday there is an hour when no believing slave performs prayer and asks Allah for anything at that time, but Allah will fulfill his need.'" Abdullah said: "The Messenger of Allah (saw) pointed to me, saying: 'Or some part of an hour.' I said: 'you are right, or some part of an hour.' I said: 'What time is that?' He said: 'It is the last hours of the day.' I said: 'It is not the time of the prayer?' He said: 'Yes (it is so), when a believing slave performs prayer and then sits with nothing but he prayer keeping him, he is still in a state of prayer.'" Daif