What therefore God has joined together, let not man separate.
The Pharisees came to Jesus with a question about divorce. He answered by going back past Moses to the opening pages of Genesis. His answer makes marriage something God Himself does. That raises the question the Pharisees never asked: if God ties the knot, who may cut it?
Past Moses to the beginning
The Pharisees wanted a ruling on what a husband may do. Jesus answered instead by pointing to what God had done long before any law was written.
The Lord uses the moment to press this truth: what God set up at the beginning of creation was always valid in itself. Moses allowed a man to divorce his wife in the law; but this was only the patience of God with the hardness of man's heart. It was not according to God's own heart and will... God had united husband and wife, and man had no right to separate them. No one may break that bond.
What Moses commanded, what Moses allowed
The Lord asked them what Moses commanded. Their reply quietly swapped that word for another, and in doing so gave themselves away.
In their reply they tried to dodge the Lord's question. They spoke not of what Moses commanded, but of what Moses allowed. Without meaning to, they showed the hardness of their hearts. They ignored the clear commands of Moses and spoke only of special rules made to fit their own hardness. The commands matched God's heart for man; the rules about divorce matched theirs.
God's act, not man's arrangement
The verse names an actor: God joined. That single word changes who is entitled to decide anything about the marriage.
Verse 9 lifts marriage from the level of man and human convenience to the level of God and His action. It is a divine institution, not a human arrangement, so men must not tamper with it. If God joins, man must not separate.
Marriage springs from God's own heart
This truth about marriage shows up at three points in the Bible. Seeing where else it appears shows how deep it goes.
Turn to Genesis and you will find God Himself bringing this verse forward in the garden of Eden. Here in Mark 10 the Lord, in the days when He lived as a man, repeats this blessed fact: marriage springs from God. And when Paul writes to the church at Ephesus in the power of the Spirit of God, he quotes this verse too... What a precious thought. What a husband and wife have taken up was not set up by man. It did not come from man's inventive mind. It comes fresh, in all its beauty and glory, from the eternal love of the heart of God. Why should man's circumstances, man's failure, hard times, or a sense of being ill-matched interfere with what has sprung from the heart of God?
Every marriage, not only believers'
The joining goes back to creation, not to faith. So this rule reaches far wider than the church.
According to God's will, marriage cannot be dissolved... This not only applies to marriages made "in the Lord," but to every marriage. Already in the Old Testament God had said to the Jews who were divorced from their wives, "For I hate divorce, says the LORD, the God of Israel" (Mal. 2:16).
Mark and Matthew
Commentators note a real difference between the Gospel accounts here. Matthew's record of the same conversation has a clause that Mark leaves out.
Mark does not even mention the one case where divorce is allowed, when the marriage tie has in fact been broken.
Other writers, reading Mark alongside Matthew, state the limit this way:
Except for sexual immorality (Matt. 19:9), the tie should never be broken... This takes us back to how God set marriage up at the start. It reminds us how God sees it — two made one flesh, joined by Him, and so not to be split apart by man.
How it shapes a marriage day to day
The verse is not only a rule against breaking up. It also tells a husband how to see the woman he lives with.
Every right-minded man will look upon his wife as the only woman in the world for him, and he will desire no other. That is not because he has chosen her for his wife, but because God has joined them together. He will look on her as the very woman God made for him. He will treat her as God's gift to him. More than that, he will treat her as himself, for the two have become one flesh. And that is no rule made by man, but God's own act and decree.
Summary
- God joins. Marriage is not a contract two people invent. It is God's action, so no human choice can undo it.
- Joined at creation. Jesus goes behind Moses to the beginning. The law's permission met hard hearts; it never matched God's heart.
- Joined for all. The rule was never only for believers. It holds for every marriage, everywhere.
- Joined, so not severed. Commentators differ. Mark records no exception, while other writers hold the tie firm except for sexual immorality.
- Joined, therefore cherished. Seeing your spouse as God's own gift, not merely your own choice, is what turns the command into a way of living.