1 Corinthians 7:39
A woman is bound to her husband during the whole period that he lives; but if her husband dies, she is at liberty to marry whom she will, provided that he is a Christian.
2 Corinthians 6:14-17
Do not come into close association with unbelievers, like oxen yoked with asses. For what is there in common between righteousness and lawlessness? Or what partnership has light with darkness?
Hebrews 6:16
For men swear by what is greater than themselves; and with them an oath in confirmation of a statement always puts an end to a dispute.
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