Divorce

"Another thing you do: You flood the Lord's altar with tears. You weep and wail because he no longer pays attention to your offerings or accepts them with pleasure from your hands. You ask, "Why?" It is because the Lord is actiong as the witness between you and the wife of your youth, because you have broken faith with her, though she is your partner, the wife of your marriage covenant. Has not the Lord made them one? In flesh and spirit they are his. And why one? Because he was seeking godly offspring. So guard yourself in your spirit, and do not break faith with the wife of your youth. "I hate divorce," says the Lord God of Israel, "and I hate a man's covering himself* with violence as well as with his garment," says the Lord Almighty. So guard yourself in you spirit, and so not break faith."
- Malachi 2:13-16 (NIV)

* Or, his wife

"Do you not know, brothers - for I am speaking to men who know the law - that the law has authority over a man only as long as he lives? For example, by law a married woman is bound to her husband as long as he is alive, but if her husband dies, she is released from the law of marriage. So then, if she marries another man while her husband is still alive, she is called an adulteress. But if her husband dies, she is released from that law and is not an adulteress, even though she marries another man."
- Romans 7:1-3 (NIV)