Mark 9:39

But Jesus said, “Do not stop him; for there is no one who will perform a miracle in My name, and be able soon afterward to speak evil of Me.

Matthew 7:22-23

Many will say to Me on that day [when I judge them], ‘Lord, Lord, have we not prophesied in Your name, and driven out demons in Your name, and done many miracles in Your name?’

Matthew 13:28-29

He replied to them, ‘An enemy has done this.’ The servants asked him, ‘Then do you want us to go and pull them out?’

Mark 10:13-14

People were bringing children to Him so that He would touch and bless them, but the disciples reprimanded them and discouraged them [from coming].

Acts 19:13-16

Then some of the traveling Jewish exorcists also attempted to call the name of the Lord Jesus over those who had evil spirits, saying, “I implore you and solemnly command you by the Jesus whom Paul preaches!”

1 Corinthians 9:27

But [like a boxer] I strictly discipline my body and make it my slave, so that, after I have preached [the gospel] to others, I myself will not somehow be disqualified [as unfit for service].

1 Corinthians 12:3

Therefore I want you to know that no one speaking by the [power and influence of the] Spirit of God can say, “Jesus be cursed,” and no one can say, “Jesus is [my] Lord,” except by [the power and influence of] the Holy Spirit.

1 Corinthians 13:1-2

If I speak with the tongues of men and of angels, but have not love [for others growing out of God’s love for me], then I have become only a noisy gong or a clanging cymbal [just an annoying distraction].

Philippians 1:18

What then [does it matter]? So long as in every way, whether in pretense [for self-promotion] or in all honesty [to spread the truth], Christ is being preached; and in this I rejoice.

Yes, and I will rejoice [later as well],

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
People were bringing children to Him so that He would touch and bless them, but the disciples reprimanded them and discouraged them [from coming].
Matthew 13:28
He replied to them, ‘An enemy has done this.’ The servants asked him, ‘Then do you want us to go and pull them out?’
Philippians 1:18
What then [does it matter]? So long as in every way, whether in pretense [for self-promotion] or in all honesty [to spread the truth], Christ is being preached; and in this I rejoice.

Yes, and I will rejoice [later as well],

There

Matthew 7:22
Many will say to Me on that day [when I judge them], ‘Lord, Lord, have we not prophesied in Your name, and driven out demons in Your name, and done many miracles in Your name?’
Acts 19:13
Then some of the traveling Jewish exorcists also attempted to call the name of the Lord Jesus over those who had evil spirits, saying, “I implore you and solemnly command you by the Jesus whom Paul preaches!”
1 Corinthians 9:27
But [like a boxer] I strictly discipline my body and make it my slave, so that, after I have preached [the gospel] to others, I myself will not somehow be disqualified [as unfit for service].
1 Corinthians 13:1
If I speak with the tongues of men and of angels, but have not love [for others growing out of God’s love for me], then I have become only a noisy gong or a clanging cymbal [just an annoying distraction].

Lightly

1 Corinthians 12:3
Therefore I want you to know that no one speaking by the [power and influence of the] Spirit of God can say, “Jesus be cursed,” and no one can say, “Jesus is [my] Lord,” except by [the power and influence of] the Holy Spirit.

General references

2 Corinthians 13:8
For we can do nothing against the truth, but only for the truth [and the gospel—the good news of salvation].