John 1:18

No man has ever seen God; God, only begotten, who is in the bosom of the Father??e has interpreted him.

John 12:41

Isaiah uttered these words because he saw his glory, and he spoke of him.

Treasury of Scripture Knowledge

Summary

And when Gideon perceived that he was an angel of the LORD, Gideon said, Alas, O Lord GOD! for because I have seen an angel of the LORD face to face.

Bible References

Because

John 1:18
No man has ever seen God; God, only begotten, who is in the bosom of the Father??e has interpreted him.
John 12:41
Isaiah uttered these words because he saw his glory, and he spoke of him.