A.T. Robertson Commentary John 6:36

"But I said unto you, that ye have seen me, and yet believe not." — John 6:36 (ASV)

That ye have seen me (οτ κα εωρακατε με). It is not certain that με is genuine. If not, Jesus may refer to verse 26. If genuine, some other saying is referred to that we do not have. Note κα (also or even).

And yet believe not (κα ου πιστευετε). Use of κα = and yet.