Albert Barnes Commentary Exodus 3:2

"And the angel of Jehovah appeared unto him in a flame of fire out of the midst of a bush: and he looked, and, behold, the bush burned with fire, and the bush was not consumed." — Exodus 3:2 (ASV)

The angel of the Lord - See the note at (Genesis 12:7). What Moses saw was the flame of fire in the bush; what he recognized in it was an intimation of the presence of God, who makes a flame of fire His angel. . The words which Moses heard were those of God Himself, as all ancient and most modern theologians have held, manifested in the Person of the Son.

Of a bush - Literally, of the bush or “seneh,” a word which should perhaps be retained as the proper name of a thorny shrub common in that district, a species of acacia.