And the angel of the LORD 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.
All Commentaries on Exodus 3:2 Go To Exodus 3
Ephrem The Syrian
AD 373
The bush which was unsuitable even as an image of dead gods was able to depict within itself the mystery of the living God. Moses, this is a sign to you: as you saw God dwelling in the midst of fire, by fire must you serve the God who dwells in the fire.