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, except that he must be a Christian.

2 Corinthians 6:14-17

Stop forming intimate and inconsistent relations with unbelievers. What partnership can right-doing have with law-breaking, or how can light participate with darkness?

Hebrews 6:16

For it is a custom among men to take oath by something greater than themselves, and an oath taken for confirmation settles any dispute among them.

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