John 4:18
for thou hast had five husbands; and he whom thou now hast is not thy husband: thou hast spoken this truly.
Mark 10:12
And if she having sent away her husband, may marry another, she commits adultery.
Romans 7:3
Then if she may be married to another man, her husband still living, she will be designated an adulteress: but if her husband may die, she is free from the law; and is no adulteress, though she is married to another man.
1 Corinthians 7:10-11
But I proclaim to those who have married, not I, but the Lord, That a wife shall not depart from her husband
Hebrews 13:4
Marriage is honorable among all, and the couch undefiled: for God will judge fornicators and adulterers.