The statement is wrong. This is a major sin.

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This is a valid reason. No need to make up nawafil fast. Moreover, Nawafil are not obligatory fasts and one can break them without making them up again.

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If you are divorcing him, your are not obliged to give him any sexual  rights. But if it is only a dispute and you want to go back to him,  you should give him his rights or you will be sinful and cursed by  angels. You must proceed immediately on filing for divorce, khulu or  going back to him.

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