1 Corinthians 7:39

The wife is bound by the law as long as her husband liveth: but if her husband be dead, she is free to be married to whomsoever she will, but only in the Lord.

2 Corinthians 6:14-17

Be not unequally yoked with infidels; for what participation hath righteousness with unrighteousness? and what fellowship [is there] between light and darkness?

Hebrews 6:16

For men indeed swear by something greater than themselves; and an oath for confirmation is with them conclusive in all disputes.

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