Moreover he said,
I am the God of your 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.
All Commentaries on Exodus 3:6 Go To Exodus 3
George Leo Haydock
Hid, out of respect, and perhaps fearing lest he should die, Genesis xvi. 13. (Calmet)
God takes the title of these three patriarchs, because he had promised Chanaan to each of them, and because they were eminent for virtue. God is repeated thrice, to insinuate the mystery of the blessed Trinity, and to show that the Lord watches over each individual, as if that one alone existed. (Menochius)