If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet. For I have given you an example, that you also should do as I have done to you.

John 13:14-15

“The washing of the feet and the sacrament of the Eucharist: two expressions of one and the same mystery of love entrusted to the disciples, so that, Jesus says, “as I have done… so also must you do” (Jn 13: 15).”  

- St. Pope John Paul II