John 1:18

No one has seen God at any time; the only begotten Son, who is in the bosom of the Father, he has revealed him.

John 12:41

These things said Isaiah, when he saw his glory, and 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 one has seen God at any time; the only begotten Son, who is in the bosom of the Father, he has revealed him.
John 12:41
These things said Isaiah, when he saw his glory, and spoke of him.