Concealing people’s sins is a matter that is subject to further discussion

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She drinks wine in front of him and he is afraid that if he divorces her, she will take the children, and she is a kaafir
Can he say “Thank you” (as in “No, thank you”) to someone who offers him wine and he does not take it?

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She drinks wine in front of him and he is afraid that if he divorces her, she will take the children, and she is a kaafir
Can he say “Thank you” (as in “No, thank you”) to someone who offers him wine and he does not take it?

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