“But I said to you
That you have seen me,
Yet you do not believe.”
ἀλλ’ εἶπον ὑμῖν ὅτι καὶ ἑωράκατέ με καὶ οὐ πιστεύετε.
John uniquely indicated that Jesus continued this discourse that was not in the other canonical synoptic gospels. Jesus rebuked them right at the start. He told them (ἀλλ’ εἶπον ὑμῖν) that they had seen, experienced, or perceived him (ὅτι καὶ ἑωράκατέ με), but still not believed or trusted him (καὶ οὐ πιστεύετε). There was no equivocation here. He was there. They could see him, but they did not believe him. Do you believe in Jesus?