1 Corinthians 6:16

16 Do you not know that he who joins himself to a prostitute becomes one body with her? For, as it is written, "The two shall become one flesh."
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.

1 Corinthians 7:10-11

10 To the married I give charge, not I but the Lord, that the wife should not separate from her husband
11 (but if she does, let her remain single or else be reconciled to her husband) --and that the husband should not divorce his wife.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.

1 Corinthians 7:39

39 A wife is bound to her husband as long as he lives. If the husband dies, she is free to be married to whom she wishes, only in the Lord.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.

Romans 7:2-3

2 Thus a married woman is bound by law to her husband as long as he lives; but if her husband dies she is discharged from the law concerning the husband.
3 Accordingly, she will be called an adulteress if she lives with another man while her husband is alive. But if her husband dies she is free from that law, and if she marries another man she is not an adulteress.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.

Ephesians 5:31

31 "For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh."
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.