1 Corinthians 7:39

A wife is bound for whatever time her husband lives; but if the husband be fallen asleep, she is free to be married to whom she will, only in the Lord.

Romans 7:2-3

For the married woman is bound by law to her husband so long as he is alive; but if the husband should die, she is clear from the law of the husband:

1 Corinthians 7:15

But if the unbeliever go away, let them go away; a brother or a sister is not bound in such cases, but God has called us in peace.

Genesis 6:2

that the sons of God saw the daughters of men that they were fair, and took themselves wives of all that they chose.

Deuteronomy 7:3-4

And thou shalt make no marriages with them: thy daughter thou shalt not give unto his son, nor take his daughter for thy son;

Malachi 2:11

Judah hath dealt unfaithfully, and an abomination is committed in Israel and in Jerusalem; for Judah hath profaned the sanctuary of Jehovah which he loved, and hath married the daughter of a strange god.

1 Corinthians 7:10

But to the married I enjoin, not I, but the Lord, Let not wife be separated from husband;

2 Corinthians 6:14-16

Be not diversely yoked with unbelievers; for what participation is there between righteousness and lawlessness? or what fellowship of light with darkness?

Treasury of Scripture Knowledge

Summary

The wife is bound by the law as long as her husband liveth; but if her husband be dead, she is at liberty to be married to whom she will; only in the Lord.

General references

Bible References

Wife

1 Corinthians 7:10
But to the married I enjoin, not I, but the Lord, Let not wife be separated from husband;
Romans 7:2
For the married woman is bound by law to her husband so long as he is alive; but if the husband should die, she is clear from the law of the husband:

Only

Genesis 6:2
that the sons of God saw the daughters of men that they were fair, and took themselves wives of all that they chose.
Deuteronomy 7:3
And thou shalt make no marriages with them: thy daughter thou shalt not give unto his son, nor take his daughter for thy son;
Malachi 2:11
Judah hath dealt unfaithfully, and an abomination is committed in Israel and in Jerusalem; for Judah hath profaned the sanctuary of Jehovah which he loved, and hath married the daughter of a strange god.
2 Corinthians 6:14
Be not diversely yoked with unbelievers; for what participation is there between righteousness and lawlessness? or what fellowship of light with darkness?

General references

Matthew 19:10
His disciples say to him, If the case of the man be so with his wife, it is not good to marry.