John 13:13

For he knew who should betray him; therefore said he, Ye are not all clean.

So after he had washed their feet, and had taken his garments, and was set down again, he said unto them, Know ye what I have done to you?

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.