The Pharisees also came to Him, testing Him, and saying to Him, "Is it lawful for a man to divorce his wife for just reason?" And He answered and said to them, "Have you not read that He who made them at the beginning made them male and female ... for this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh? So then, they are no longer two but one flesh. Therefore what God has joined together, let not separate." They said to Him, "Why then did Moses command to give a certificate of divorce, and to put her away/" He said to them, "Moses, because of the hardness of our hearts, permitted you to divorce your wives, but from the beginning it was not so. And I say to you, whoever divorces his wife, except for sexual immorality, and marries another, commits adultery; and whoever marries her who is divorced commits adultery." (Matthew 19:3-9)

Now to the married I command, yet not I but the Lord: A wife is not to depart from her husband. But even if she does depart, let her remain unmarried or be reconciled to her husband. And a husband is not to divorce his wife. But to the rest I , not the Lord, say: If any brother has a wife who does not believe, and she is willing to live with him, let him not divorce her. And a woman who has a husband who does not believe, if he is willing to live with her, let her not divorce her. For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband; otherwise your children would be unclean, but now they are holy. But if the unbeliever departs, let him depart; a brother or a sister is not under bondage in such cases. But God has called us to peace. For how do you know, O wife, whether you will save your husband? Or how do you know, O husband, whether you will save your wife? But as God has distributed to each one, as the Lord has called each one, so let him walk. And so I ordain to all the churches. (1 Corinthians 7:10-17)

Furthermore it has been said, "Whoever divorces his wife, let him give her a certificate of divorce." But I say to you that whoever divorces his wife for any reason except sexual immorality causes her to commit adultery; and whoever marries a woman who is divorced commits adultery. (Matthew 5:31, 32)

Whoever divorces his wife and marries another commits adultery; and whoever marries her who is divorced from her husband commits adultery. (Luke 16:18)

"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. (Jeremiah 3:1)