Mark 9:33-37 - Who Is the Greatest? (ERV)
33 Jesus and his followers went to Capernaum. They went into a house, and Jesus said to them, “I heard you arguing on the way here today. What were you arguing about?”
34 But the followers did not answer, because their argument on the road was about which one of them was the greatest.
35 Jesus sat down and called the twelve apostles to him. He said, “Whoever wants to be the most important must make others more important than themselves. They must serve everyone else.”
36 Then Jesus took a small child and stood the child in front of the followers. He held the child in his arms and said,
37 “Whoever accepts children like these in my name is accepting me. And anyone who accepts me is also accepting the one who sent me.”

Luke 22:24-30 - Be Like a Servant - (ERV)
24 Later, the apostles began to argue about which one of them was the most important.
25 But Jesus said to them, “The kings of the world rule over their people, and those who have authority over others want to be called ‘the great providers for the people.’
26 But you must not be like that. The one with the most authority among you should act as if he is the least important. The one who leads should be like one who serves.
27 Who is more important: the one serving or the one sitting at the table being served? Everyone thinks it’s the one being served, right? But I have been with you as the one who serves.
28 “You men have stayed with me through many struggles.
29 So I give you authority to rule with me in the kingdom the Father has given me.
30 You will eat and drink at my table in that kingdom. You will sit on thrones and judge the twelve tribes of Israel.