No-one has seen the Father except the one who is from God; only he has seen the Father.
Jesus wanted to dispel any misunderstanding about how the people would be taught of God. They could never come directly to God and receive instruction from Him; they were in need of a mediator. There is only One who has direct access into the Father’s presence: the One who was sent by the Father and came from Him. Nobody else had ever seen God, or ever will, apart from the way into His presence which only Jesus could provide. The only way for us to see God is to see Christ.
Joh 14:9 Jesus answered: “Don’t you know me, Philip, even after I have been among you such a long time? Anyone who has seen me has seen the Father. How can you say, ‘Show us the Father’?