"Teacher," said John, "we saw a man driving out demons in your name and we told him to stop, because he was not one of us."
"Do not stop him," Jesus said. "No one who does a miracle in my name can in the next moment say anything bad about me, for whoever is not against us is for us. I tell you the truth, anyone who gives you a cup of water in my name because you belong to Christ will certainly not lose his reward.
Mark 9:38-41 NIV