John 13:6-9

6He comes therefore to Simon Peter; and he says to him, Lord, dost thou wash my feet?

7Jesus answered and said to him, What I do thou dost not know now, but thou shalt know hereafter.

8Peter says to him, Thou shalt never wash my feet. Jesus answered him, Unless I wash thee, thou hast not part with me.

9Simon Peter says to him, Lord, not my feet only, but also my hands and my head.