John 13:12-17   12. So after he had washed their feet, and had taken his garments, and was set down again, he said unto them, Know ye what I have done to you? 13. Ye call me Master and Lord: and ye say well; for so I am. 14. If I then, your Lord and Master, have washed your feet; ye also ought to wash one another's feet. 15. For I have given you an example, that ye should do as I have done to you. 16. Verily, verily, I say unto you, The servant is not greater than his lord; neither he that is sent greater than he that sent him. 17. If ye know these things, happy are ye if ye do them.

Philippians 2:4-8   4. Look not every man on his own things, but every man also on the things of others. 5. Let this mind be in you, which was also in Christ Jesus: 6. Who, being in the form of God, thought it not robbery to be equal with God: 7. But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: 8. And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.