John 13:12-15

And so, after he washed their feet and received his vestments, when he had sat down at table again, he said to them: "Do you know what I have done for you? You call me Teacher and Lord, and you speak well: for so I am. Therefore, if I, your Lord and Teacher, have washed your feet, you also ought to wash the feet of one another. For I have given you an example, so that just as I have done for you, so also should you do.