John 13:13-17

Ye call me Master and Lord: and ye say well; for so I am.

If I then, your Lord and Master, have washed your feet; ye also ought to wash one another's feet.

For I have given you an example, that ye should do as I have done to you.

Verily, verily, I say unto you, The servant is not greater than his lord; neither he that is sent greater than he that sent him.

If ye know these things, happy are ye if ye do them.