If he was alone, he must perform sujood assahu. If he is praying behind the Imam, there is nothing for him to do as the Imam carries his mistakes as long as he entered with the Imam from the first Rakah and the mistake is not a pillar.

Sheikh if a Muslim forgot to say Rabbana Wa lakal-Hamd in Salaah while praying behind imam or alone .then what should he do.?

Prayer | January 24, 2016 3:33 am
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I prayed salat al maghrib around 14-15 minutes after the adhan (without any reason I was having a shower).I mean the maghrib is at 6:01 PM and I said Allahu Akbar at 6:15 PM , ‘isha is at 7:32. I’m to worried If I prayed out of its time,I used to hear that maximun 15-20 min to pray maghrib. When I started praying the colour of the sky was not red was a LIGHT BLUE. Should I repent?