Mark 9:39

"None of you must prevent the man," answered Jesus, "for no one will use my name in working a miracle, and yet find it easy to speak evil of me.

Matthew 7:22-23

On 'That Day' many will say to me 'Master, Master, was not it in your name that we taught, and in your name that we drove out demons, and in your name that we did many miracles?'

Matthew 13:28-29

'An enemy has done this,' was his answer. 'Do you wish us, then,' they asked,' to go and gather them together?'

Mark 10:13-14

Some of the people were bringing little children to Jesus, for him to touch them; but the disciples found fault with those who had brought them.

Acts 19:13-16

An attempt was made by some itinerant Jews, who were exorcists, to use the Name of the Lord Jesus over those who had wicked spirits in them. "I adjure you," they would say, "by the Jesus, whom Paul preaches."

1 Corinthians 9:27

No, I bruise my body and make it my slave, lest I, who have called others to the contest, should myself be rejected.

1 Corinthians 12:3

Therefore I tell you plainly that no one who speaks under the influence of the Spirit of God says 'JESUS IS ACCURSED,' and that no one can say 'JESUS IS LORD,' except under the influence of the Holy Spirit.

1 Corinthians 13:1-2

Though I speak in the 'tongues' of men, or even of angels, yet have not Love, I have become mere echoing brass, or a clanging cymbal!

Philippians 1:18

But what of that? Only that in some way or other, either with assumed or with real earnestness, Christ is being made known; and at that I 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
Some of the people were bringing little children to Jesus, for him to touch them; but the disciples found fault with those who had brought them.
Matthew 13:28
'An enemy has done this,' was his answer. 'Do you wish us, then,' they asked,' to go and gather them together?'
Philippians 1:18
But what of that? Only that in some way or other, either with assumed or with real earnestness, Christ is being made known; and at that I rejoice.

There

Matthew 7:22
On 'That Day' many will say to me 'Master, Master, was not it in your name that we taught, and in your name that we drove out demons, and in your name that we did many miracles?'
Acts 19:13
An attempt was made by some itinerant Jews, who were exorcists, to use the Name of the Lord Jesus over those who had wicked spirits in them. "I adjure you," they would say, "by the Jesus, whom Paul preaches."
1 Corinthians 9:27
No, I bruise my body and make it my slave, lest I, who have called others to the contest, should myself be rejected.
1 Corinthians 13:1
Though I speak in the 'tongues' of men, or even of angels, yet have not Love, I have become mere echoing brass, or a clanging cymbal!

Lightly

1 Corinthians 12:3
Therefore I tell you plainly that no one who speaks under the influence of the Spirit of God says 'JESUS IS ACCURSED,' and that no one can say 'JESUS IS LORD,' except under the influence of the Holy Spirit.

General references

2 Corinthians 13:8
We have no power at all against the Truth, but we have power in the service of the Truth.