From the Gospel according to Mark 9:38-40
John said to Jesus,
"Teacher, we saw someone driving out demons in your name,
and we tried to prevent him because he does not follow us."
Jesus replied, "Do not prevent him.
There is no one who performs a mighty deed in my name
who can at the same time speak ill of me.
For whoever is not against us is for us."
The Gospel of the Lord.
Praise to you, Lord Jesus Christ.