It is haraam to bury the dead inside mosques

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Check below answers in case you are looking for other related questions:
To whom should condolences be offered among the family of the deceased?
Praising of the deceased

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Related Answers:
Offering condolences to a non-Muslim on the death of a relative
Does weeping and shedding tears for the deceased cause him any harm?
How long should burial of the deceased be delayed when waiting for his relatives?
To whom should condolences be offered among the family of the deceased?
Praising of the deceased

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