John 4:18
for you have had five husbands, and the one whom you now have is not your husband; this you have said truly."
Mark 10:12
And if she divorces her husband and marries another man, she commits adultery."
Romans 7:3
So then, 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 though she marries another man, she is not an adulteress.
1 Corinthians 7:10-11
To the married I give charge, not I but the Lord, that the wife should not separate from her husband
Hebrews 13:4
Let marriage be held in honor among all, and let the marriage bed be undefiled; for God will judge the immoral and adulterous.