John 13:8

Then he poured water into the basin, and began to wash the disciples’ feet and to wipe them with the towel that was wrapped around him.

Then he came to Simon Peter. He said to him, “Lord, do you wash my feet?”

Jesus answered him, “You don’t know what I am doing now, but you will understand later.”

Simon Peter said to him, “Lord, not my feet only, but also my hands and my head!”

Jesus said to him, “Someone who has bathed only needs to have his feet washed, but is completely clean. You are clean, but not all of you.”

For he knew him who would betray him; therefore he said, “You are not all clean.”