Mark 9:39

But Jesus said, "Do not forbid him, for no one who does a miracle in my name can soon afterward 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.' The servants said to him, 'Then do you want us to go and gather them up?'

Mark 10:13-14

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

Acts 19:13-16

But also some of the Jewish exorcists, who went from place to place, attempted to name over those who had the evil spirits the name of the Lord Jesus, saying, "I adjure you by Jesus whom Paul preaches."

1 Corinthians 9:27

But I discipline my body and make it my slave, so that, after I have preached to others, I myself will not be disqualified.

1 Corinthians 12:3

Therefore I tell you that no one who is speaking by the Spirit of God says, "Jesus be cursed," and no one can say, "Jesus is Lord," except by 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 this 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; but the disciples rebuked them.
Matthew 13:28
He said to them, 'An enemy has done this.' The servants said to him, 'Then do you want us to go and gather them up?'
Philippians 1:18
What then? Only that in every way, whether in pretense or in truth, Christ is proclaimed; and in this 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
But also some of the Jewish exorcists, who went from place to place, attempted to name over those who had the evil spirits the name of the Lord Jesus, saying, "I adjure you by Jesus whom Paul preaches."
1 Corinthians 9:27
But I discipline my body and make it my slave, so that, after I have preached to others, I myself will not 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 tell you that no one who is speaking by the Spirit of God says, "Jesus be cursed," and no one can say, "Jesus is Lord," except by the Holy Spirit.

General references

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