Albert Barnes Commentary John 7:28

"Jesus therefore cried in the temple, teaching and saying, Ye both know me, and know whence I am; and I am not come of myself, but he that sent me is true, whom ye know not." — John 7:28 (ASV)

Ye know whence I am. You have sufficient evidence of my divine mission, and that I am the Messiah.

Is true. Is worthy to be believed. He has given evidence that I came from him, and he is worthy to be believed. Many read this as a question—Do you know me, and know from where I am? I have not come of myself, etc.