Mark 9:39

But Jesus said, Do not forbid him. For there is no one who shall do a work of power in My name who can lightly speak evil of Me.

Matthew 7:22-23

Many will say to Me in that day, Lord! Lord! Did we not prophesy in Your name, and through Your name throw out demons, and through Your name do many wonderful works?

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 brought children to Him, so that He should touch them. And His disciples rebuked those bringing them.

Acts 19:13-16

And certain from the strolling Jews, exorcists, undertook to name the name of the Lord Jesus over those having evil spirits, saying, We adjure you by Jesus whom Paul preaches.

1 Corinthians 9:27

But I buffet my body, and lead it captive, lest proclaiming to others I myself might be rejected.

1 Corinthians 12:3

Therefore I make known to you that no one speaking by the Spirit of God says Jesus is a curse, and that no one can say that Jesus is Lord, but by the Holy Spirit.

1 Corinthians 13:1-2

Though I speak with the tongues of men and of angels, and have not charity, I have become as sounding brass or a tinkling cymbal.

Philippians 1:18

What then? Nevertheless, in every way, whether in pretense or in truth, Christ is preached. And I rejoice in this. Yet, also 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 brought children to Him, so that He should touch them. And His disciples rebuked those bringing 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? Nevertheless, in every way, whether in pretense or in truth, Christ is preached. And I rejoice in this. Yet, also I will rejoice.

There

Matthew 7:22
Many will say to Me in that day, Lord! Lord! Did we not prophesy in Your name, and through Your name throw out demons, and through Your name do many wonderful works?
Acts 19:13
And certain from the strolling Jews, exorcists, undertook to name the name of the Lord Jesus over those having evil spirits, saying, We adjure you by Jesus whom Paul preaches.
1 Corinthians 9:27
But I buffet my body, and lead it captive, lest proclaiming to others I myself might be rejected.
1 Corinthians 13:1
Though I speak with the tongues of men and of angels, and have not charity, I have become as sounding brass or a tinkling cymbal.

Lightly

1 Corinthians 12:3
Therefore I make known to you that no one speaking by the Spirit of God says Jesus is a curse, and that no one can say that Jesus is Lord, but by the Holy Spirit.

General references

2 Corinthians 13:8
For we have no power against the truth, but for the truth.