Mark 9:35-40

35And he sat down, and called the twelve, and saith unto them, If any man desire to be first, the same shall be last of all, and servant of all. 36And he took a child, and set him in the midst of them: and when he had taken him in his arms, he said unto them, 37Whosoever shall receive one of such children in my name, receiveth me: and whosoever shall receive me, receiveth not me, but him that sent me.

38And 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. 39But 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. 40For he that is not against us is on our part.