mark 9: 38-40 NWT
38 John said to him: ?Teacher, we saw a certain man expelling demons by the use of your name and we tried to prevent him, because he was not accompanying us.? 39 But Jesus said: ?Do not try to prevent him, for there is no one that will do a powerful work on the basis of my name that will quickly be able to revile me; 40 for he that is not against us is for us.
KJV
38 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.
39 But 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.
40 For he that is not against us is on our part.