You have never known him, but I know him. If I said I did not know him, I would be a liar like you. But I do know him, and I keep his word.
In context
53Are you greater than our father Abraham? He died, and the prophets died. Who do you make yourself out to be?” 54Jesus answered, “If I glorify myself, my glory is worth nothing. It is my Father who glorifies me — the one of whom you say, ‘He is our God.’ 55You have never known him, but I know him. If I said I did not know him, I would be a liar like you. But I do know him, and I keep his word. 56Your father Abraham was overjoyed that he would see my day; he saw it, and he was glad.” 57The Jews said to him, “You are not yet fifty years old, and you have seen Abraham?”