If you prayed the whole prayer with the Imam, he carries over your mistakes! But if you missed a rakah or two, you should prostrate for forgetfulness!

If im praying behind the imam and forget to day rabbana wa lakal hamd when rising from ruku’, what do i do, do i repeat the entire prayer afterwards?

Prayer | July 26, 2014 10:13 am
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Just 10minutes before adhaan fajr i did tahajud.when adhaan fajr is “on”,i just shockly remember that i did tahajud without wudhu(totally forgot).is my tahajud valid in Allah’s side? I did taraweeh and witr already right away after salah ishaa
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“A salah without du’a is useless”. Is it true?