Mark 9:38

38 John said to him, "Teacher, we saw a man who was driving out demons in your name, and we told him to stop, because he doesn't belong to our group."

Mark 9:38 In-Context

36 Then he took a child and had him stand in front of them. He put his arms around him and said to them,
37 "Whoever welcomes in my name one of these children, welcomes me; and whoever welcomes me, welcomes not only me but also the one who sent me."
38 John said to him, "Teacher, we saw a man who was driving out demons in your name, and we told him to stop, because he doesn't belong to our group."
39 "Do not try to stop him," Jesus told them, "because no one who performs a miracle in my name will be able soon afterward to say evil things about me.
40 For whoever is not against us is for us.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.