Exodus 3:2-5

2And the angel of the Lord appeared to him in a flame of fire out of the midst of a bush. He looked, and behold, the bush was burning, yet it was not consumed.

3And Moses said, "I will turn aside to see this great sight, why the bush is not burned."

4When the Lord saw that he turned aside to see, God called to him out of the bush, "Moses, Moses!" And he said, "Here I am."

5Then he said, "Do not come near; take your sandals off your feet, for the place on which you are standing is holy ground."