He was not able to pray before he died; can prayers be offered on his behalf?

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Check below answers in case you are looking for other related questions:
He loves his deceased father and wants to do something good for him
What can benefit the deceased after his death? Can he hear what the living say?

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She stopped praying when she was sick, then she died; do her heirs have to do anything?
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He loves his deceased father and wants to do something good for him
What can benefit the deceased after his death? Can he hear what the living say?

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