Sequence matters. Jesus washes first; we wash next. He demonstrates; we follow. He uses the towel then extends it to us, saying, “Now you do it. Walk across the floor of your upper room, and wash the feet of your Judas.” So go ahead. Get your feet wet. Remove your socks and shoes, and set your feet in the basin. First one, then the other. Let the hands of God wipe away every dirty part of your life— your dishonesty, adultery, angry outbursts, hypocrisy, pornography. Let him touch them all. As his hands do their work, look across the room. Forgiveness may not happen all at once. But it can happen with you. After all, you have wet feet. (emphasis mine)
Lucado, Max (2012-09-11). Grace: More Than We Deserve, Greater Than We Imagine (p. 62). Thomas Nelson. Kindle Edition.