Mark 9:33-35

33 Then He came to Capernaum. And when He was in the house He asked them, "What was it you disputed among yourselves on the road?"

34 But they kept silent, for on the road they had disputed among themselves who would be the greatest.

35 And He sat down, called the twelve, and said to them, "If anyone desires to be first, he shall be last of all and servant of all."