John 13:7 in the King James Version
Jesus answered and said unto him, What I do thou knowest not now; but thou shalt know hereafter.
Context
6 Then he came to Simon Peter. He said to him, “Lord, do you wash my feet?”
7 Jesus answered him, “You don’t know what I am doing now, but you will understand later.”
8 Peter said to him, “You will never wash my feet!” Jesus answered him, “If I don’t wash you, you have no part with me.”