1 Corinthians 7:39

The wife is bound as long as her husband lives; but if her husband die, she is free to be married to whom she will, only in the Lord.

2 Corinthians 6:14-17

Be not unequally yoked together with unbelievers: for what fellowship has righteousness with lawlessness? What communion has light with darkness?

Hebrews 6:16

For, verily, men swear by the greater, and an oath for confirmation is to them an end of all contradiction.

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