Mark 9:39 Meaning: Who Does Jesus Welcome to Serve?
But Jesus said, “Don’t forbid him, for there is no one who will do a mighty work in my name and be able quickly to speak evil of me.
But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me.
But Jesus said, Forbid him not: for there is no man who shall do a mighty work in my name, and be able quickly to speak evil of me.
And Jesus said, `Forbid him not, for there is no one who shall do a mighty work in my name, and shall be able readily to speak evil of me:
But Jesus said, Forbid him not; for there is no one who shall do a miracle in my name, and be able soon [after] to speak ill of me;
Meaning in one sentence
Jesus tells his disciples not to stop a man casting out demons because he doesn't follow them. He teaches that genuine work in his name deserves openness.
Context
This exchange takes place right after Jesus has taught his disciples about humility, he set a child in their midst and said that welcoming a child in his name is welcoming him. Then John speaks up with a concern: they saw a man driving out demons in Jesus' name, but they stopped him because he was not part of their group. The disciples had just been arguing about who was greatest, and now they are drawing lines around who gets to act in Jesus' name. Jesus answers directly, expanding their vision. The whole scene is about the difference between guarding your own circle and recognizing God's work wherever it appears.
Key Words
The Greek word for mighty work is dunamis, which means power, the kind of power that comes from God, not human effort. When Jesus says the man does a work of power in my name, he is pointing to something real: God is backing it. This is not a claim the man makes for himself; it is power that shows itself in results.
The adverb tachu can be translated quickly or readily. Jesus says a person who does genuine miracles in his name cannot readily turn around and curse him. There is a moral and spiritual logic to it: authentic ministry in Christ's name creates a bond, even a protection, that makes immediate hostility unlikely. The man may not be perfect, but he is not an enemy.
And the verb kōluō, forbid or hinder, carries the sense of putting up a barrier. Jesus tells his disciples to take down the barrier they have erected. The call is not to approve every doctrine, but to stop blocking something God is clearly doing.
How Christians Read This Verse
Wesley saw in this verse a lovely example of candour and moderation, urging Christians not to discourage anyone who brings sinners from Satan to God, even if they differ in opinions or worship. Clarke, writing from the Methodist tradition, called a spirit of bigotry an evil disease that would rather let sinners perish than let someone outside the group save them. Calvin, while noting that Christ did not necessarily approve of everything the man did, said we should rejoice when the glory of Christ is advanced in any way. The Cambridge Bible links the passage to Numbers 11, where Moses refused to stop men prophesying because they were not in the official camp, saying he wished all God's people were prophets. Across traditions, Christians have read this verse as a caution against guarding ministry turf at the expense of recognizing God's work through unexpected people.
A common misunderstanding
Living This Out
This week you may encounter a Christian from another tradition, a different denomination, a style of worship that is not yours, a ministry that does things differently. Your first instinct might be to look for what is wrong. Jesus asks you to look for what is real. If someone is serving in his name and people are being helped, set down your instinct to forbid or correct. You don't have to agree on everything to rejoice that Christ's name is being honored. Let that one encounter teach your heart to be a little wider than it was before.
Main takeaway: A person doing real good in Jesus' name is not his enemy, and we should not treat them as one.
For Families
For ages 5, 8
John saw a man helping people in Jesus' name, but he told him to stop because he was not in their group. Jesus said no, if someone is doing good in my name, let them do it.
For ages 9, 12
Imagine you and your friends are playing a game and someone else shows up wanting to help. Your first thought might be, they are not on our team. But if they are playing fair and helping everyone have fun, why stop them? Jesus said the same thing about a man casting out demons. God's power was at work, and that mattered more than being in the right group. This week, when you see someone doing something good for Jesus even if they are different from you, try saying, 'That is great' instead of 'Why did they do that?'
Questions People Ask
Why did John forbid the man from casting out demons?
John explains that the man was not following them, he was not part of Jesus' inner circle of disciples. John and the others likely thought that only they had the right to use Jesus' name for miracles. But Jesus corrected this, showing that God's power can work through people outside our immediate group.
What does 'quickly speak evil of me' mean?
The Greek word 'tachu' means readily or quickly. Jesus means that a person who is genuinely doing miracles in his name cannot immediately turn around and curse or insult him. Their own actions would contradict them. The miracle itself gives evidence that they depend on his authority, at least in that moment.
Does this verse mean any ministry using Jesus' name is valid?
Not exactly. Jesus points to the result: a work of power is happening, which is something only God can do. That visible evidence of God's backing is the key. In Matthew 7:22-23, Jesus warns that some who do mighty works in his name are not truly known by him. So discernment is still needed, but the starting point is openness to what God is doing, not suspicion.
How does this relate to the story of the sons of Sceva in Acts 19?
In Acts 19, some Jewish exorcists try to use Jesus' name without having a relationship with him, and a demon-possessed man attacks them. That story shows the danger of using the name without faith or authority. But in Mark 9, the man is successfully casting out demons, which means God is genuinely working through him. The difference is the power actually shows up.
Does Jesus' command to not forbid the man mean we should never correct other Christians?
Not at all. Jesus himself corrected his disciples and later the apostles corrected churches. But the context here is about drawing lines around who gets to do ministry at all. The disciples were forbidding someone from serving in Jesus' name simply because he was not in their circle. Jesus says that is the wrong reason to stop someone. Correction should be about truth and sin, not about who belongs to our group.
For pastors & researchers
Greek interlinear, 8 commentaries & word study