And the woman who has a husband that believes not, and if he be pleased to dwell with her, let her not leave him.
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Ambrosiaster
AD 400
Paul says this in the case of two Gentiles, one of whom has become a believer. Normally, a pagan detests Christianity, and a Christian does not want to be contaminated by paganism, which is why Paul says that if they are happy to stay together, they should continue to do so. Commentary on Paul’s Epistles.