Mark 9:39

"Do not try to stop him," Jesus answered, "for there is no one who performs a miracle in my name who can soon speak evil of me.

Matthew 7:22-23

"Many in that day will say to me, "'Lord, Lord, have we not prophesied in your name, and in your name cast out demons, and in your name done many mighty works?'

Matthew 13:28-29

"'It is an enemy who has done this,' he answered. "The slaves said to him, 'Do you want us to go and collect them?'

Mark 10:13-14

Now people were bringing little children to Jesus for him to touch them; but the disciples rebuked them.

Acts 19:13-16

But there were also some strolling Jewish exorcists, who took it upon them to invoke the name of Jesus over those who had evil spirits, saying, "I adjure you by that Jesus whom Paul preaches."

1 Corinthians 9:27

but I bruise my body and keep it in subjection, lest having called others to the contest, I should myself be disqualified.

1 Corinthians 12:3

Wherefore I want you to understand that no one who speaks in the Spirit of God says, "Jesus is accursed," and no one can say, "Jesus is Lord," except in the Holy Spirit.

1 Corinthians 13:1-2

Though I speak in the tongues of men and of angels, but have no love, I am become a clanging brass, or a clashing cymbal.

Philippians 1:18

What of it? In any case, whether in pretence or in honest truth, Christ is still preached, and in that I am rejoicing, yes, and 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
Now people were bringing little children to Jesus for him to touch them; but the disciples rebuked them.
Matthew 13:28
"'It is an enemy who has done this,' he answered. "The slaves said to him, 'Do you want us to go and collect them?'
Philippians 1:18
What of it? In any case, whether in pretence or in honest truth, Christ is still preached, and in that I am rejoicing, yes, and will rejoice.

There

Matthew 7:22
"Many in that day will say to me, "'Lord, Lord, have we not prophesied in your name, and in your name cast out demons, and in your name done many mighty works?'
Acts 19:13
But there were also some strolling Jewish exorcists, who took it upon them to invoke the name of Jesus over those who had evil spirits, saying, "I adjure you by that Jesus whom Paul preaches."
1 Corinthians 9:27
but I bruise my body and keep it in subjection, lest having called others to the contest, I should myself be disqualified.
1 Corinthians 13:1
Though I speak in the tongues of men and of angels, but have no love, I am become a clanging brass, or a clashing cymbal.

Lightly

1 Corinthians 12:3
Wherefore I want you to understand that no one who speaks in the Spirit of God says, "Jesus is accursed," and no one can say, "Jesus is Lord," except in the Holy Spirit.

General references

2 Corinthians 13:8
For I have no power against the truth, but only in defense of the truth.