Mark 9:33-37

³³They came to Capernaum. When he was in the house, he asked them, "What were you arguing about on the road?" ³⁴But they kept quiet because on the way they had argued about who was the greatest.

³⁵Sitting down, Jesus called the Twelve and said, "If anyone wants to be first, he must be the very last, and the servant of all."

³⁶He took a little child and had him stand among them. Taking him in his arms, he said to them, ³⁷"Whoever welcomes one of these little children in my name welcomes me; and whoever welcomes me does not welcome me but the one who sent me."