Actions while Praying
Bukhari :: Book 2 :: Volume 22 :: Hadith 324
Narrated Abu Huraira:
Allah's Apostle said, "When anyone of you stands for the prayers, Satan comes and puts him in doubts till he forgets how many Rakat he has prayed. So if this happens to anyone of you, he should perform two prostrations of Sahu while sitting.
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