John 13:14 - Coke's Commentary on the Holy Bible

If I then—have washed your feet, &c.— This was, even to a proverb, one of the lowest offices of menial attendants. See 1 Samuel 25:41. Dr. Evans well observes, (Christian Temper, vol. i, p. 81.) that our Lord chose this kind office, though not necessary in itself, more strongly to impress the minds of his disciples, and to shew that they ought to regard, not only the necessary preservation, but the mutual comfort of each other.