Mark 9:39

But Jesus said, "Do not stop him, for no one who does a mighty work in my name will be able soon afterward to speak evil of me.

Matthew 7:22-23

On that day many will say to me, 'Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?'

Matthew 13:28-29

He said to them, 'An enemy has done this.' So the servants said to him, 'Then do you want us to go and gather them?'

Mark 10:13-14

And they were bringing children to him that he might touch them, and the disciples rebuked them.

Acts 19:13-16

Then some of the itinerant Jewish exorcists undertook to invoke the name of the Lord Jesus over those who had evil spirits, saying, "I adjure you by the Jesus whom Paul proclaims."

1 Corinthians 9:27

But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.

1 Corinthians 12:3

Therefore I want you to understand that no one speaking in the Spirit of God ever says "Jesus is accursed!" and no one can say "Jesus is Lord" except in the Holy Spirit.

1 Corinthians 13:1-2

If I speak in the tongues of men and of angels, but have not love, I am a noisy gong or a clanging cymbal.

Philippians 1:18

What then? Only that in every way, whether in pretense or in truth, Christ is proclaimed, and in that I rejoice. Yes, and I will rejoice,

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

Forbid

Mark 10:13
And they were bringing children to him that he might touch them, and the disciples rebuked them.
Matthew 13:28
He said to them, 'An enemy has done this.' So the servants said to him, 'Then do you want us to go and gather them?'
Philippians 1:18
What then? Only that in every way, whether in pretense or in truth, Christ is proclaimed, and in that I rejoice. Yes, and I will rejoice,

There

Matthew 7:22
On that day many will say to me, 'Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?'
Acts 19:13
Then some of the itinerant Jewish exorcists undertook to invoke the name of the Lord Jesus over those who had evil spirits, saying, "I adjure you by the Jesus whom Paul proclaims."
1 Corinthians 9:27
But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.
1 Corinthians 13:1
If I speak in the tongues of men and of angels, but have not love, I am a noisy gong or a clanging cymbal.

Lightly

1 Corinthians 12:3
Therefore I want you to understand that no one speaking in the Spirit of God ever says "Jesus is accursed!" and no one can say "Jesus is Lord" except in the Holy Spirit.

General references

2 Corinthians 13:8
For we cannot do anything against the truth, but only for the truth.

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.