Bukhari :: Book 2 :: Volume 13 :: Hadith 57
Narrated Abu Huraira:
Allah's Apostle (p.b.u.h) talked about Friday and said, "There is an hour (opportune time) on Friday and if a Muslim gets it while praying and asks something from Allah, then Allah will definitely meet his demand." And he (the Prophet) pointed out the shortness of that time with his hands.
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