Ruling on burying the dead in a large underground chamber in which they are placed next to one another

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Is it permissible to bury the husband with his wife in one grave?
Should the person who has been killed wrongfully be washed?

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Burial in non-Muslim graveyards
It is haraam to build anything over graves
Is the one who dies in a car accident a martyr (shaheed)?
Is it permissible to bury the husband with his wife in one grave?
Should the person who has been killed wrongfully be washed?

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