NET
28 Then Jesus said, “When you lift up the Son of Man, then you will know that I am he, and I do nothing on my own initiative, but I speak just what the Father taught me.
Darby
28 Jesus therefore said to them, When ye shall have lifted up the Son of man, then ye shall know that I am [he], and [that] I do nothing of myself, but as the Father has taught me I speak these things.
KJV
28 Then said Jesus unto them, “When ye have lifted up the Son of man, then shall ye know that I am” [he], “and” [that] “I do nothing of myself; but as my Father hath taught me, I speak these things.”