'Abdullah ibn Salam relates: "I said, and the Messenger of Allah was sitting: 'We find in the Book of Allah that on Friday there is an 'hour' in which, if a believing slave prays to Allah for something, his prayer is (indeed) accepted and he is granted what ever he prays for.' The Messenger of Allah pointed toward me and said: 'Or part of an hour.' I said: 'You have spoken the truth: or part of an hour.' I asked: 'What hour is it?' He replied: 'The last hour of the day.' I remarked: 'That is not a time of salah?' He responded: 'Certainly [it is]; if a believing slave offers salah and then sits, he will not be sitting, save due to the salah, and he will be in salah."' [Ibn Majah]