John 8:14 ESV "Jesus answered, Even if I do bear witness about myself, my testimony is true, for I know where I came from and where I am going, but you do not know where I come from and where I am going".
"I come from"-erchomai-present tense.
A] "After this Jesus went about in Galilee. He would not go about in Judea, because the Jews were seeking to kill him". John 7:1.
Is it His coming and going in Galilee which Jesus says to the Pharisees that they do not know? Jesus has been avoiding the Jews and as a result they would not know His movements and where He might appear next.
Even when Jesus comes to Judea the Jews are ignorant of His physical whereabouts as in John 7:11 "Where is he?"
B] Or, is it His coming from the Father into the lives of those to whom He gives life [John 5:21] that they do not know. As in John 14:18 "I will come to you"?
The people Jesus is talking to in John 8:14 do not presently know Jesus coming into their lives as their Saviour sent by the Father [1 John 4:14].
What is Jesus referring to when He says-you do not know where "I come from"?