The author writes "For I hate divorce, says the LORD, the God of Israel" (Mal 2:16).  Judah is chastised for divorcing his wife and priests are warned that they shall be cursed because they caused many to falter by their void instructions.  Priests have wearied God by teaching that evil is good.

Bible Excerpts Malachi 2
1 And now, O priests, this commandment is for you: If you do not listen,
2 And if you do not lay it to heart, to give glory to my name, says the LORD of hosts, I will send a curse upon you and of your blessing I will make a curse. Yes, I have already cursed it, because you do not lay it to heart. ...
7 For the lips of the priest are to keep knowledge, and instruction is to be sought from his mouth, because he is the messenger of the LORD of hosts.
8 But you have turned aside from the way, and have caused many to falter by your instruction; you have made void the covenant of Levi, says the LORD of hosts.
9 I, therefore, have made you contemptible and base before all the people, since you do not keep my ways, but show partiality in your decisions.
10 Have we not all the one Father? Has not the one God created us? Why then do we break faith with each other, violating the covenant of our fathers?
11 Judah has broken faith; an abominable thing has been done. ...
14 And you say, "Why is it?"-- Because the LORD is witness between you [Judah] and the wife of your youth, with whom you have broken faith though she is your companion, your betrothed wife.
15 Did he not make one being, with flesh and spirit: and what does that one require but godly offspring? You must then safeguard life that is your own, and not break faith with the wife of your youth.
16 For I hate divorce, says the LORD, the God of Israel, and covering one's garment with injustice, says the LORD of hosts; you must then safeguard life that is your own, and not break faith.
17 You have wearied the LORD with your words, yet you say, "How have we wearied him?" By your saying, "Every evildoer is good in the sight of the LORD, and he is pleased with him"; or else, "Where is the just God?"
 

I Cor  7:10-11  (commentery)
10: To the married I give charge, not I but the Lord*, that the wife should not separate from her husband
11: (but if she does, let her remain single or else be reconciled to her husband) -- and that the husband should not divorce his wife.
12: To the rest I say, not the Lord, that if any brother has a wife who is an unbeliever, and she consents to live with him, he should not divorce her.
13: If any woman has a husband who is an unbeliever, and he consents to live with her, she should not divorce him.
14: For the unbelieving husband is consecrated through his wife, and the unbelieving wife is consecrated through her husband. Otherwise, your children would be unclean, but as it is they are holy.
15: But if the unbelieving partner desires to separate, let it be so; in such a case the brother or sister is not bound. For God has called us to peace.
     * footnote (Not I, but the Lord): Paul reminds the married of Jesus' principle of nonseparation
        (Mark 10:9). This is one of his rare specific references to the teaching of Jesus.
 

Matthew 19:9
1 When Jesus had finished saying these things, he left Galilee and went into the region of Judea to the other side of the Jordan.
2  Large crowds followed him, and he healed them there.
3 Some 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,'
5 and 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'?
6 So 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?"
8 Jesus replied, "Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning.
9 I tell you that anyone who divorces his wife, except for marital unfaithfulness, and marries another woman commits adultery."

Mark 10:11-12
1 Jesus then left that place and went into the region of Judea and across the Jordan. Again crowds of people came to him, and as was his custom, he taught them.
2 Some 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.
4 They 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,
8 and the two will become one flesh.' So they are no longer two, but one.
9 Therefore what God has joined together, let man not separate."
10 When they were in the house again, the disciples asked Jesus about this.
11 He answered, "Anyone who divorces his wife and marries another woman commits adultery against her.
12 And if she divorces her husband and marries another man, she commits adultery."
 
Matthew 5:32  Divorce
31 "It has been said, 'Anyone who divorces his wife must give her a certificate of divorce.'
32 But 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.

Luke 16:18
14 The Pharisees, who loved money, 10 heard all these things and sneered at him.
15 And he said to them, "You justify yourselves in the sight of others, but God knows your hearts; for what is of human esteem is an abomination in the sight of God.
16 "The law and the prophets lasted until John; 11 but from then on the kingdom of God is proclaimed, and everyone who enters does so with violence.
17 It is easier for heaven and earth to pass away than for the smallest part of a letter of the law to become invalid.
18 "Everyone who divorces his wife and marries another commits adultery, and the one who marries a woman divorced from her husband commits adultery.