Mark 9:39

And Jesus said, 'Forbid him not, for there is no one who shall do a mighty work in my name, and shall be able readily to speak evil of me:

Matthew 7:22-23

Many will say to me in that day, Lord, lord, have we not in thy name prophesied? and in thy name cast out demons? and in thy name done many mighty things?

Matthew 13:28-29

And he saith to them, A man, an enemy, did this; and the servants said to him, Wilt thou, then, that having gone away we may gather it up?

Mark 10:13-14

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

Acts 19:13-16

And certain of the wandering exorcist Jews, took upon them to name over those having the evil spirits the name of the Lord Jesus, saying, 'We adjure you by Jesus, whom Paul doth preach;'

1 Corinthians 9:27

but I chastise my body, and bring it into servitude, lest by any means, having preached to others -- I myself may become disapproved.

1 Corinthians 12:3

wherefore, I give you to understand that no one, in the Spirit of God speaking, saith Jesus is anathema, and no one is able to say Jesus is Lord, except in the Holy Spirit.

1 Corinthians 13:1-2

If with the tongues of men and of messengers I speak, and have not love, I have become brass sounding, or a cymbal tinkling;

Philippians 1:18

what then? in every way, whether in pretence or in truth, Christ is proclaimed -- and in this I rejoice, yea, and shall 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 to him children, that he might touch them, and the disciples were rebuking those bringing them,
Matthew 13:28
And he saith to them, A man, an enemy, did this; and the servants said to him, Wilt thou, then, that having gone away we may gather it up?
Philippians 1:18
what then? in every way, whether in pretence or in truth, Christ is proclaimed -- and in this I rejoice, yea, and shall rejoice.

There

Matthew 7:22
Many will say to me in that day, Lord, lord, have we not in thy name prophesied? and in thy name cast out demons? and in thy name done many mighty things?
Acts 19:13
And certain of the wandering exorcist Jews, took upon them to name over those having the evil spirits the name of the Lord Jesus, saying, 'We adjure you by Jesus, whom Paul doth preach;'
1 Corinthians 9:27
but I chastise my body, and bring it into servitude, lest by any means, having preached to others -- I myself may become disapproved.
1 Corinthians 13:1
If with the tongues of men and of messengers I speak, and have not love, I have become brass sounding, or a cymbal tinkling;

Lightly

1 Corinthians 12:3
wherefore, I give you to understand that no one, in the Spirit of God speaking, saith Jesus is anathema, and no one is able to say Jesus is Lord, except in the Holy Spirit.

General references

2 Corinthians 13:8
for we are not able to do anything against the truth, but for the truth;