1 Corinthians 7:39

A woman is bound as long as her husband lives; but if her husband is dead then she is free to be married to whom she will; only in the Lord.

2 Corinthians 6:14-17

Be not unequally yoked with unbelievers; for what participation has righteousness with wickedness? or what communion has light with darkness?

Hebrews 6:16

For men indeed swear by a greater, and an oath for confirmation is to them an end of all dispute;

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