Mk 9:38-50
John said to Jesus, “Teacher, we saw a man casting out demons in your name, and we forbade him, because he was not following us.” But Jesus said, “Do not forbid him; for no one who does a mighty work in my name will be able soon after to speak evil of me. For he that is not against us is for us. For truly, I say to you, whoever gives you a cup of water to drink because you bear the name of Christ, will by no means lose his reward. “Whoever causes one of these little ones who believe in me to sin, it would be better for him if a great millstone were hung round his neck and he were thrown into the sea.