We believe the feet washing should precede the Lord’s Supper. It prepares the heart to serve one another in humility and love, and thus leads to a close communion. John 13:1-17.
“These words mean more than bodily cleanliness. Christ is still speaking of the higher cleansing as illustrated by the lower.. When Jesus girded Himself with a towel to wash the dust from their feet, He desired by that very act to wash the alienation, jealousy, and pride from their hearts. This was of far more consequence than the washing of their dusty feet. With the spirit they then had, not one of them was prepared for communion with Christ.
Until brought into a state of humility and love, they were not prepared to partake of the paschal supper, or to share in the memorial service which Christ was about to institute.” -The Desire of Ages, p. 646.