Luke 9: 46 - 50
And an argument arose among them as to which of them was the greatest.
But when Jesus perceived the thought of their hearts, he took a child and put him by his side,
and said to them, "Whoever receives this child in my name receives me, and whoever receives me receives him who sent me; for he who is least among you all is the one who is great."
John answered, "Master, we saw a man casting out demons in your name, and we forbade him, because he does not follow with us."
But Jesus said to him, "Do not forbid him; for he that is not against you is for you."