This is the third of Jesus’s six comments on legal matters. The first two (murder and adultery) took a command from the Decalogue and extended it to the thoughts and motivations which lay behind the particular sinful act. So, “do not murder” becomes “control your angry thoughts” and “do not commit adultery” becomes “control you lustful thoughts.” With his comments on divorce, Jesus enters into a rabbinic discussion of Deuteronomy 24:1-4 and the meaning of the “indecent thing” in 24:1. He will then deal with making (and breaking) oaths (5:33-37).

Jesus deals with divorce by grounding the idea of marriage in the creation. Humans were designed to enter into lifelong relationships, spiritual unions which create families and foster a community where children are raised. He alludes to the creation of humans as male and female (Gen 1:27) and quotes Genesis 2:24 as support for marriage. In the context of Genesis humans were designed to work and they were designed to build communities around the ideal family. This is the way things work best, although in the present world they are corrupted by sin.
Since marriage is embedded in creation itself, it is foolish to try to live in another way. (A related question is the issue of a person choosing not to marry at all. It is not my point here to say the only way someone can be happy and wise is to marry, see below on Matthew 19). People often choose to do the less-than-ideal thing and often indulge in foolishness with wild abandon!
With respect to the application of this teaching, the ideal for humans is a life-long marriage, but sin corrupts everything and sometimes things happen which prevent us from reaching that ideal.
Jesus intended divorce to be a rarity, but the fact he teaches on the issue indicates he knew it would happen. Like the wisdom tradition, he recognizes that God has designed humans to have marriage relationships, but he also recognizes human frailty (hard-heartedness) results in a breakdown of what God has intended. No one goes into a marriage expecting it to fail, but sometimes it does. A person experiencing marriage problems ought to be treated with grace and acceptance, in the same way we might accept a person who is an alcoholic as we help them to deal with their problem.
In a contemporary context, there are far more things breaking down marriages than adultery. If there is any abuse of either the wife or the children, the wife should separate for the safety of herself and children. Divorce and remarriage is one of those things which is “not the way God created us to be” and our sinful world makes it very difficult to live our lives fully to the ideal to which we have been create.
Jesus gives a similar teaching on divorce in Matthew 19:1-12. In response to a question from a group of Pharisees Jesus draws attention to the creation story and the original intention of marriage. If God’s intention was for a marriage to continue “until death do us part,” then the Pharisees ask why Moses permitted divorce in Deuteronomy 24:1-4. Jesus repeats what he said in the Sermon on the Mount but adds the observation Moses added the possibility of divorce because the human heart is hard (19:8).
This might have surprised the disciples, who wonder if it is better not to marry (v. 10). Jesus responds to this with one of the more enigmatic sayings in Matthew” there are some people who are eunuchs for the sake of the kingdom of heaven (v. 11-12). Not all can accept this voluntary celibacy, but those who can, Jesus says, should accept it.
With respect to modern application, this verse has been used far beyond Jesus’s original intent to defend traditional marriage or to prevent a woman from leaving an abusive marriage. In order to understand Jesus, we need to learn something about the state of marriage and divorce in Second Temple Judaism, read his brief comments in that context before drawing reasonable application to contemporary practice.
Historically, has the church missed the point on marriage and divorce? Is divorce permitted for a Christian? How can contemporary Christianity help develop a biblical view of marriage and reach out to people who have experienced the pain of divorce?
Adultery does not happen by accident. There is a period of temptation that occurs before the actual action itself. But where does that process start? I would suggest one’s view of marriage and relationships between the sexes are shaped from a very young age. If a young man is taught adultery is acceptable in some situations or he observes sexual harassment and mistreatment of women regularly, then it is likely those behaviors will be normative for him.
Jesus uses some very strong language to describe how we are to handle this problem. If this is taken literally all men would have been blinded in junior high school. This verse does not teach self-mutilation as a cure for sin.
Jesus says a fellow disciple “has something against you,” implying the disciple has indeed wronged a fellow disciple. Since the one who has done the wrong needs to reach out and begin the process of reconciliation, the person knows they are in the wrong and are causing a disruption within the family.
Second, if anyone calls his brother raca he is liable before the council. Raca is fairly common Aramaic word (רֵיקָא or רֵיקָה, or ῥακά in Greek) meaning “numskull” or “fool” (BDAG). Sometimes pastors will state the word is particularly foul; I have occasionally said raca is a four-letter F–word in order to tease out the shock value. But even with this there is some flexibility, some people would have to be extremely angry to drop an f-bomb on someone, others use the word so frequently it is no longer a shock.