Charles Ellicott 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. —Hebrew, an angel of Jehovah. In Exodus 3:4, the angel is called both “Jehovah” and “Elohim,” from which it is concluded, with reason, that it was the Second Person of the Trinity who appeared to Moses.

Out of the midst of a bush. —Literally, out of the midst of the acacia. As the seneh, or acacia, is very common in the Sinaitic region, we can scarcely suppose that a special tree, growing alone, is intended. Probably the article is one of reference, and the meaning is, “the bush of which you have all heard.” (Compare to John 3:24.)