John 13:3-7

Jesus, knowing that the Father had given all things into his hands, and that he came forth from God, and goeth unto God, riseth from supper, and layeth aside his garments; and he took a towel, and girded himself. Then he poureth water into the basin, and began to wash the disciples’ feet, and to wipe them with the towel wherewith he was girded. So he cometh to Simon Peter. He saith unto him, Lord, dost thou wash my feet? Jesus answered and said unto him, What I do thou knowest not now; but thou shalt understand hereafter.