Mark 9:33-41 New Revised Standard Version (NRSV)
Who Is the Greatest?
33 Then they came to Capernaum; and when he was in the house he asked them, “What were you arguing about on the way?” 34 But they were silent, for on the way they had argued with one another who was the greatest. 35 He sat down, called the twelve, and said to them, “Whoever wants to be first must be last of all and servant of all.” 36 Then he took a little child and put it among them; and taking it in his arms, he said to them, 37 “Whoever welcomes one such child in my name welcomes me, and whoever welcomes me welcomes not me but the one who sent me.”
38 John said to him, “Teacher, we saw someone[a] casting out demons in your name, and we tried to stop him, because he was not following us.” 39 But Jesus said, “Do not stop him; for no one who does a deed of power in my name will be able soon afterward to speak evil of me. 40 Whoever is not against us is for us. 41 For truly I tell you, whoever gives you a cup of water to drink because you bear the name of Christ will by no means lose the reward.