Mark 9:33-37 NIV

[33] They came to Capernaum. When he was in the house, he asked them, “What were you arguing about on the road?” [34] But they kept quiet because on the way they had argued about who was the greatest. [35] Sitting down, Jesus called the Twelve and said, “Anyone who wants to be first must be the very last, and the servant of all.” [36] He took a little child whom he placed among them. Taking the child 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.”