If a person prays for more than one deceased person, what will his reward be?

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Check below answers in case you are looking for other related questions:
What it is Sunnah to say at the burial
Women’s bad behaviour in graveyards

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Related Answers:
Does mentioning the deceased and grieving over him harm him in his grave?
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If there is anything on the body of the deceased that will prevent water from reaching the skin, should it be removed?
What it is Sunnah to say at the burial
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