Genesis 2
²⁴ For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh.

Deuteronomy 22
¹⁹ They shall fine him a hundred shekels of silver and give them to the girl's father, because this man has given an Israelite virgin a bad name. She shall continue to be his wife; he must not divorce her as long as he lives.

Deuteronomy 24
¹ If a man marries a woman who becomes displeasing to him because he finds something indecent about her, and he writes her a certificate of divorce, gives it to her and sends her from his house, ² and if after she leaves his house she becomes the wife of another man, ³ and her second husband dislikes her and writes her a certificate of divorce, gives it to her and sends her from his house, or if he dies, ⁴ then her first husband, who divorced her, is not allowed to marry her again after she has been defiled. That would be detestable in the eyes of the LORD . Do not bring sin upon the land the LORD your God is giving you as an inheritance.

Matthew 19
Divorce
¹When Jesus had finished saying these things, he left Galilee and went into the region of Judea to the other side of the Jordan. ²Large crowds followed him, and he healed them there. ³Some Pharisees came to him to test him. They asked, "Is it lawful for a man to divorce his wife for any and every reason?" ⁴"Haven't you read," he replied, "that at the beginning the Creator 'made them male and female,'  ⁵and said, 'For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh'  ? ⁶So they are no longer two, but one. Therefore what God has joined together, let man not separate."  ⁷"Why then," they asked, "did Moses command that a man give his wife a certificate of divorce and send her away?" ⁸Jesus replied, "Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning. ⁹I tell you that anyone who divorces his wife, except for marital unfaithfulness, and marries another woman commits adultery." ¹⁰The disciples said to him, "If this is the situation between a husband and wife, it is better not to marry." ¹¹Jesus replied, "Not everyone can accept this word, but only those to whom it has been given. ¹²For some are eunuchs because they were born that way; others were made that way by men; and others have renounced marriage because of the kingdom of heaven. The one who can accept this should accept it."

Malachi 2
¹³ 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. ¹⁴ You ask, "Why?" It is because the LORD is acting 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. ¹⁵ 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.  ¹⁶ "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 your spirit, and do not break faith.

Matthew 5
Divorce
³¹"It has been said, 'Anyone who divorces his wife must give her a certificate of divorce.' ³²But I tell you that anyone who divorces his wife, except for marital unfaithfulness, causes her to become an adulteress, and anyone who marries the divorced woman commits adultery.

Mark 10
²Some Pharisees came and tested him by asking, "Is it lawful for a man to divorce his wife?"  ³"What did Moses command you?" he replied.  ⁴They said, "Moses permitted a man to write a certificate of divorce and send her away." ⁵"It was because your hearts were hard that Moses wrote you this law," Jesus replied. ⁶"But at the beginning of creation God 'made them male and female.'  ⁷'For this reason a man will leave his father and mother and be united to his wife,  ⁸and the two will become one flesh.'  So they are no longer two, but one. ⁹Therefore what God has joined together, let man not separate."  ¹⁰When they were in the house again, the disciples asked Jesus about this. ¹¹He answered, "Anyone who divorces his wife and marries another woman commits adultery against her. ¹²And if she divorces her husband and marries another man, she commits adultery."

1 Corinthians 7
¹⁰To the married I give this command (not I, but the Lord): A wife must not separate from her husband. ¹¹But if she does, she must remain unmarried or else be reconciled to her husband. And a husband must not divorce his wife. ¹²To the rest I say this (I, not the Lord): If any brother has a wife who is not a believer and she is willing to live with him, he must not divorce her. ¹³And if a woman has a husband who is not a believer and he is willing to live with her, she must not divorce him. ¹⁴For the unbelieving husband has been sanctified through his wife, and the unbelieving wife has been sanctified through her believing husband. Otherwise your children would be unclean, but as it is, they are holy. ¹⁵But if the unbeliever leaves, let him do so. A believing man or woman is not bound in such circumstances; God has called us to live in peace. ¹⁶How do you know, wife, whether you will save your husband? Or, how do you know, husband, whether you will save your wife?