Sayyiduna Abdullah bin Salam (may Allah be pleased with him) said: While the Messenger of Allah (peace and blessings be upon him) was sitting, I said: "We find in the Book of Allah that on Friday there is an hour such that no believing servant coincides with it while praying and asks Allah for something, except that Allah fulfils his need." Abdullah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) pointed towards me, saying: "Part of an hour." I said: "You have spoken the truth, part of an hour." I asked: "Which hour is it?" He (peace and blessings be upon him) said: "The last hours of the day." I said: "But that is not an hour of prayer." He (peace and blessings be upon him) said: "Indeed it is. When the believing servant prays, then sits and nothing holds him back except the prayer, he is counted as being in prayer."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14002