Mark 9:38 in the King James Version
And John answered him, saying, Master, we saw one casting out devils in thy name, and he followeth not us: and we forbad him, because he followeth not us.
Context
37 “Whoever receives one such little child in my name receives me; and whoever receives me, doesn’t receive me, but him who sent me.”
38 John said to him, “Teacher, we saw someone who doesn’t follow us casting out demons in your name; and we forbade him, because he doesn’t follow us.”
39 But Jesus said, “Don’t forbid him, for there is no one who will do a mighty work in my name and be able quickly to speak evil of me.