He is afraid that he caused his wife’s death

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Check below answers in case you are looking for other related questions:
His wife is careless about prayers – should he divorce her?
He goes out to call people to Allah and leaves his family despite their need for him

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Related Answers:
Woman goes out to gatherings of dhikr without permission
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Should he try not to have children with his Christian wife?
His wife is careless about prayers – should he divorce her?
He goes out to call people to Allah and leaves his family despite their need for him

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