John 13:15

So when he had washed their feet, put his outer garment back on, and sat down again, he said to them, “Do you know what I have done to you?

You call me, ‘Teacher’ and ‘Lord.’ You say so correctly, for so I am.

If I then, the Lord and the Teacher, have washed your feet, you also ought to wash one another’s feet.

Most certainly I tell you, a servant is not greater than his lord, neither is one who is sent greater than he who sent him.

If you know these things, blessed are you if you do them.

I don’t speak concerning all of you. I know whom I have chosen; but that the Scripture may be fulfilled, ‘He who eats bread with me has lifted up his heel against me.’