Assalamu alaikum wa rehmatAllah, If this is a recurring problem in every salah, you need to work on developing khushoo (focus and attention) in your salah. If you are not certain, assume you didn’t perform it and do it and then offer two prostration s of sahu after Salam.

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Wa alaikumsalam wa rahmatallah wa barakatuhu, Basically, he has to be purified of his sins in hell for a period of time that can reach years but eventually he will be admitted to paradise.

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