1 Corinthians 7:39

A wife is bound to her husband as long as he lives. If her husband dies, she is free to marry anyone she pleases so long as he is a Christian.

2 Corinthians 6:14-17

Do not get into close and incongruous relations with unbelievers. What partnership can uprightness have with iniquity, or what can light have to do with darkness?

Hebrews 6:16

For men make oath by something greater than themselves, and they accept an oath as settling finally any disagreement they may have.

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