Matthew 18:2-5
2He called a little child and had him stand among them. 3And he said: "I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven. 4Therefore, whoever humbles himself like this child is the greatest in the kingdom of heaven. 5"And whoever welcomes a little child like this in my name welcomes me."
Luke 22:24-27
24Also a dispute arose among them as to which of them was considered to be greatest. 25Jesus said to them, "The kings of the Gentiles lord it over them; and those who exercise authority over them call themselves Benefactors. 26But you are not to be like that. Instead, the greatest among you should be like the youngest, and the one who rules like the one who serves. 27For who is greater, the one who is at the table or the one who serves? Is it not the one who is at the table? But I am among you as one who serves."
John 13:2-17
2The evening meal was being served, and the devil had already prompted Judas Iscariot, son of Simon, to betray Jesus. 3Jesus knew that the Father had put all things under his power, and that he had come from God and was returning to God; 4so he got up from the meal, took off his outer clothing, and wrapped a towel around his waist. 5After that, he poured water into a basin and began to wash his disciples' feet, drying them with the towel that was wrapped around him. 6He came to Simon Peter, who said to him, "Lord, are you going to wash my feet?" 7Jesus replied, "You do not realize now what I am doing, but later you will understand." 8"No," said Peter, "you shall never wash my feet." Jesus answered, "Unless I wash you, you have no part with me."
9"Then, Lord," Simon Peter replied, "not just my feet but my hands and my head as well!"
10Jesus answered, "A person who has had a bath needs only to wash his feet; his whole body is clean. And you are clean, though not every one of you." 11For he knew who was going to betray him, and that was why he said not every one was clean. 12When he had finished washing their feet, he put on his clothes and returned to his place. "Do you understand what I have done for you?" he asked them. 13"You call me 'Teacher' and 'Lord,' and rightly so, for that is what I am. 14Now that I, your Lord and Teacher, have washed your feet, you also should wash one another's feet. 15I have set you an example that you should do as I have done for you. 16I tell you the truth, no servant is greater than his master, nor is a messenger greater than the one who sent him. 17Now that you know these things, you will be blessed if you do them.
Philippians 2:3-11
3Do nothing out of selfish ambition or vain conceit, but in humility consider others better than yourselves. 4Each of you should look not only to your own interests, but also to the interests of others. 5Your attitude should be the same as that of Christ Jesus: 6Who, being in very nature God, did not consider equality with God something to be grasped, 7but made himself nothing, taking the very nature of a servant, being made in human likeness. 8And being found in appearance as a man, he humbled himself and became obedient to death-even death on a cross! 9Therefore God exalted him to the highest place and gave him the name that is above every name, 10that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, 11and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.