Matthew 5:31

3The Pharisees also came to Him, testing Him, and saying to Him, "Is it lawful for a man to divorce his wife for just any reason?"
7They said to Him, "Why then did Moses command to give a certificate of divorce, and to put her away?"

1"When a man takes a wife and marries her, and it happens that she finds no favor in his eyes because he has found some uncleanness in her, and he writes her a certificate of divorce, puts it in her hand, and sends her out of his house, 2when she has departed from his house, and goes and becomes another man's wife, 3if the latter husband detests her and writes her a certificate of divorce, puts it in her hand, and sends her out of his house, or if the latter husband dies who took her as his wife, 4then her former husband who divorced her must not take her back to be his wife after she has been defiled; for that is an abomination before the LORD, and you shall not bring sin on the land which the LORD your God is giving you as an inheritance.

1"They say, "If a man divorces his wife, And she goes from him And becomes another man's, May he return to her again?' Would not that land be greatly polluted? But you have played the harlot with many lovers; Yet return to Me," says the LORD.

2The Pharisees came and asked Him, "Is it lawful for a man to divorce his wife?" testing Him. 3And He answered and said to them, "What did Moses command you?" 4They said, "Moses permitted a man to write a certificate of divorce, and to dismiss her." 5And Jesus answered and said to them, "Because of the hardness of your heart he wrote you this precept. 6But from the beginning of the creation, God "made them male and female.' 7"For this reason a man shall leave his father and mother and be joined to his wife, 8and the two shall become one flesh'; so then they are no longer two, but one flesh. 9Therefore what God has joined together, let not man separate."