John 13:12-15

After he had washed their feet, had put on his robe, and had returned to the table, he said to them, “Do you know what I have done to you? You call me Teacher and Lord—and you are right, for that is what I am. So if I, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet. For I have set you an example, that you also should do as I have done to you.