But I tell you that anyone who divorces his wife forces her to be guilty of adultery. The only reason for a man to divorce his wife is if she has sexual relations with another man. And anyone who marries that divorced woman is guilty of adultery.
Leviticus 20:10
10 And the man that committeth adultery with another man's wife, even he that committeth adultery with his neighbour's wife, the adulterer and the adulteress shall surely be put to death.