John 13:5

3Jesus, knowing that the Father had given all things into his hands, and that he came from God and was going to God,

4arose from supper, and laid aside his outer garments. He took a towel and wrapped a towel around his waist.

5Then 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.

6Then he came to Simon Peter. He said to him, “Lord, do you wash my feet?”

7Jesus answered him, “You don’t know what I am doing now, but you will understand later.”