Let this mind be in you, which was also in Christ Jesus: who, being in the form of God, thought it not robbery to be equal with God: but made himself of no reputation, and took upon him the form of a servant. Phil. 2:5-7.
A Seventh-day Adventist evangelist was confronted with the question of why his church was so particular about the Sabbath when others were not. He said, "We believe in observing the Sabbath in honor of Creation, because that's what the Bible says. And we want to follow what the Bible says."
The person who was confronting him replied, "No one really follows all that the Bible says. It can't be done. If you really believed and follows everything the Bible says, then you would wash one another's feet!"
And the Adventist evangelist said, "We do!"
It's true that there are very few in the Christian churches of today who believe in celebrating all the parts of the Lord's Supper. Some take only the wafer or the bread, some take the bread and the cup, but very few follow the foot-washing ordinance as well.
John 13 is the only place in the four Gospels that describes the ordinance of foot washing. Let's read it, beginning with the first verse: "Now before the feast of the passover, when Jesus knew that his hour was come that he should depart out of this world unto the Father, having loved his own which were in the world, he loved them unto the end. And supper being ended, the devil having put into the heart of Judas Iscariot, Simon's son, to betray him; Jesus knowing that the Father had given all things into his hands, and that he was come from God, and went to God; he riseth from supper, and laid aside his garments; and took a towel, and girded himself. After that he poureth water into a basin, and began to wash the disciple's feet, and to wipe them with the towel wherewith he was girded."
What a picture! The Creator of the universe stooping to wash the tired, dusty feet of the creatures that He had made. It was a sandbox illustration of His incarnation, when He laid aside His kingly robes in heaven and came down to be born as one of us, that He might be able to minister to our needs. Jesus is revealed in the communion service in a special way. He is revealed as the One who was not ashamed to call us brethren, to meet us where we are, and to cleanse us from the defilement of sin.