Charles Ellicott Commentary Exodus 3:6

"Moreover he said, I am the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob. And Moses hid his face; for he was afraid to look upon God." — Exodus 3:6 (ASV)

The God of thy father. — It is generally agreed that “father” is put collectively here for “forefathers.” . Hence St. Stephen, quoting the passage, renders it, I am the God of thy fathers (Acts 7:32).

The God of Abraham. — Primarily, no doubt, the meaning was, the God who was worshipped by Abraham, Isaac, and Jacob; but the form of the expression, “the God of Abraham,” etc., indicated the continued existence of the patriarchs after death, since He can only be the God of existent, and not of nonexistent things. .

Moses hid his face, with the same feeling which made Jacob exclaim, How dreadful is this place! (Genesis 28:17). Though nothing was to be seen but an appearance as of material fire, the knowledge that God was there rendered the fire awful.