A.T. Robertson Commentary John 6:46

"Not that any man hath seen the Father, save he that is from God, he hath seen the Father." — John 6:46 (ASV)

This one has seen the Father (ουτος εωρακεν τον πατερα). Perfect active indicative of οραω. With the eyes no one has seen God (1:18) save the Son who is "from God" in origin (1:1,14; 7:29; 16:27; 17:8). The only way for others to see God is to see Christ (14:9).