John 13:3-5,12-15 (NASB) --- Jesus, knowing that the Father had given all things into His hands, and that He had come forth from God and was going back to God, got up from supper, and laid aside His garments; and taking a towel, He girded Himself. Then He poured water into the basin, and began to wash the disciples' feet and to wipe them with the towel with which He was girded.
… So when He had washed their feet, and taken His garments and reclined at the table again, He said to them, "Do you know what I have done to you? "You call Me Teacher and Lord; and you are right, for so I am. "If I then, the Lord and the Teacher, washed your feet, you also ought to wash one another's feet. "For I gave you an example that you also should do as I did to you.
Matthew 20:28 (NASB) --- just as the Son of Man did not come to be served, but to serve, and to give His life a ransom for many."