Mark 9:38-42

John said to Him, “Teacher, we saw someone casting out demons in Your name, and we tried to prevent him because he was not following us.” But Jesus said, “Do not hinder him, for there is no one who will perform a miracle in My name, and be able soon afterward to speak evil of Me. For he who is not against us is for us. For whoever gives you a cup of water to drink because of your name as followers of Christ, truly I say to you, he will not lose his reward. “Whoever causes one of these little ones who believe to stumble, it would be better for him if, with a heavy millstone hung around his neck, he had been cast into the sea.