God’s original plan for the human race, as indicated in his creation of Adam and Eve as husband and wife (Genesis 1:27-28; 2:22-25), is lifelong, monogamous marriage. Jesus affirmed this in responding to a question about divorce:
And Pharisees came up to him and tested him by asking, “Is it lawful to divorce one's wife for any cause?” He answered, “Have you not read that he who created them from the beginning made them male and female [from Genesis 1:27], and said, ‘Therefore a man shall leave his father and his mother and hold fast to his wife, and the two shall become one flesh’ [from Genesis 2:24]? So they are no longer two but one flesh. What therefore God has joined together, let not man separate.” (Matthew 19:3-6 ESV)
In this reply Jesus rebukes and corrects a first-century practice of easy divorce for trivial reasons. For example, the Mishnah said:
The school of Shammai say: A man may not divorce his wife unless he has found unchastity in her. … And the school of Hillel say … [he may divorce her] even if she spoiled a dish for him. … Rabbi Akiba says, [he may divorce her] even if he found another fairer than she. (Michnah, Gittin 9:10) 
Rather than entering into this debate among rabbis, Jesus affirms God’s original plan for marriage and shows that it is still his ideal for all marriages.
The Old Testament prophet Malachi views marriage as a “covenant” between a husband and wife. Furthermore, God is a witness to this covenant, and he will hold people accountable for it: “The Lord was witness between you and the wife of your youth, to whom you have been faithless, though she is your companion and your wife by covenant” (Malachi 2:14 ESV).
Therefore, marriage is an especially serious commitment (1) between husband and wife, (2) to the society in which they live, and (3) before God himself (whether or not he is explicitly acknowledged in the marriage ceremony).
It is important to begin any discussion about divorce and remarriage with a clear affirmation that God’s original intention is that a husband and wife remain married to each other for their entire lives, or, as the traditional marriage ceremony puts it, “so long as you both shall live.”
Although God allows divorce as a remedy in some cases where marriages are irreparably damaged, Scripture still shows that God’s question to be asked of any couple contemplating divorce should be, “Is it possible that this marriage can be restored and preserved?”
But people everywhere have experienced painful divorces, including children who still are deeply grieved because their mothers and fathers dissolved their marriages many years ago, and adults who did not want a divorce at all but whose spouses filed for divorce anyway. Perhaps that describes you, even now. It's normal to experience deep pain and sorrow, and the feeling of being deserted and betrayed, many years later—though you may seldom mention it to anyone.
Christians who have been through divorces also have a wonderful encouragement to realize that Jesus understand our sufferings and is willing to walk beside us in them:
For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin. Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need. (Hebrews 4:15-16)
Although Jesus was never married, and so he never experienced divorce specifically, he certainly knew what it was to be betrayed and abandoned by friends who were close to him, particularly Judas, who had been with him for three remarkable years (see Matthew 26:14, 25, 47; see also v. 56: “all the disciples left him and fled”). Christians can pray directly to Jesus, knowing that he understands desertion more deeply than any human friend ever will.
It is also important for Christians who have experienced divorces not to let the rest of their lives be ruled by this pain from the past. For children who have suffered deeply from divorces, Peter’s words have special relevance, showing that Christ’s sacrifice purchased freedom for us even from any wrongful patterns of life that we experienced from our parents:
You were ransomed from the futile ways inherited from your forefathers, not with perishable things such as silver or gold, 19 but with the precious blood of Christ, like that of a lamb without blemish or spot. (1 Peter 1:18-19)
And for adults who have been abandoned by a previous wife or husband, the promise of God’s comfort in 2 Corinthians should also bring great encouragement:
Blessed be the God and Father of our Lord Jesus Christ, the Father of mercies and God of all comfort, who comforts us in all our affliction, so that we may be able to comfort those who are in any affliction, with the comfort with which we ourselves are comforted by God. For as we share abundantly in Christ's sufferings, so through Christ we share abundantly in comfort too. (2 Corinthians 1:3-5 ESV)
Maybe you’re a married person reading this, even someone who was wrongfully divorced in the past and have now married someone else. God’s purpose for you from this point onward is to ask him for forgiveness for wrongs done in the past and then to seek God’s blessing on your present marriage. He does not want you now to get another divorce, but to stay married. Therefore, no matter what circumstances led up to this present marriage, if you are married, you are now married to the right person, and God wants you to make that marriage a good one for the rest of your life.
1. The Mishnah was put in written form in the late second century or early third century AD, but it reflects earlier oral tradition, including much from before the time of Christ. With respect to this particular quotation, both Hillel (died AD 10) and Shammai (50 BC-AD 30) lived prior to Jesus’ earthly ministry.
Content taken from What the Bible Says About Divorce and Remarriage by Wayne Grudem, ©2021. Used by permission of Crossway.