Exodus 3:2-6

2The Angel of the Lord appeared to him in a blazing flame of fire from the midst of a bush; and he looked, and behold, the bush was on fire, yet it was not consumed.

3So Moses said, “I must turn away [from the flock] and see this great sight—why the bush is not burned up.”

4When the Lord saw that he turned away [from the flock] to look, God called to him from the midst of the bush and said, “Moses, Moses!” And he said, “Here I am.”

5Then God said, “Do not come near; take your sandals off your feet [out of respect], because the place on which you are standing is holy ground.”

6Then He said, “I am the God of your father, the God of Abraham, the God of Isaac, and the God of Jacob.” Then Moses hid his face, because he was afraid to look at God.