So when He had washed their feet, taken His garments, and sat down again, He said to them, "Do you know what I have done to you? You call Me Teacher and Lord, and you say well, for so I am. If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet. For I have given you an example, that you should do as I have done to you. Most assuredly, I say to you, a servant is not greater than His master; nor is he who is sent greater than he who sent him. If you know these things, blessed are you if you do them."'
John 13:2a,3-5, 12-17