John 4:18
for you have had five husbands, and he whom you now have is not your husband. In this you have spoken truly.
Mark 10:12
and if a woman puts away her husband, and is married to another, she commits adultery.
Romans 7:3
So then, if, while her husband lives, she be married to another man, she shall be called an adulteress. But if her husband die, she is free from the law; so that she is not an adulteress, though she be married to another man.
1 Corinthians 7:10-11
But to the married I give commandment, not I, but the Lord: Let not the wife leave her husband:
Hebrews 13:4
Marriage is honorable among all men, and the bed undefiled; but lewd men and adulterers God will judge.