John 13:9 Meaning

7Jesus answered and said unto him, What I do thou knowest not now; but thou shalt know hereafter.

8Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.

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

10Jesus saith to him, He that is washed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all.

11For he knew who should betray him; therefore said he, Ye are not all clean.