Mark 9:35-40

35And he sat down and called the twelve. And he said to them, "If anyone would be first, he must be last of all and servant of all."

36And he took a child and put him in the midst of them, and taking him in his arms, he said to them,

37"Whoever receives one such child in my name receives me, and whoever receives me, receives not me but him who sent me."

38John said to him, "Teacher, we saw someone casting out demons in your name, and we tried to stop him, because he was not following us."

39But Jesus said, "Do not stop him, for no one who does a mighty work in my name will be able soon afterward to speak evil of me.

40For the one who is not against us is for us.