John 4:18
for you have had five husbands, and the man you now have is not your husband. What you have said is true."
Mark 10:12
and if any woman divorces her husband to marry another man, she commits adultery."
Romans 7:3
So if she marries another man while her husband is living, she is called an adulteress, but if he dies, she is free from that marriage bond, so that she will not be an adulteress though later married to another man.
1 Corinthians 7:10-11
To the people already married I give this instruction -- no, not I but the Lord -- that a wife is not to leave her husband.
Hebrews 13:4
Marriage must be held in honor by all, and the marriage relations kept sacred. Persons who are sexually vicious and immoral God will punish.