Exodus 3:2-5

2The angel of the Lord appeared to him in a flame of fire from within a bush. He looked – and the bush was ablaze with fire, but it was not being consumed!

3So Moses thought, “I will turn aside to see this amazing sight. Why does the bush not burn up?”

4When the Lord saw that he had turned aside to look, God called to him from within the bush and said, “Moses, Moses!” And Moses said, “Here I am.”

5God said, “Do not approach any closer! Take your sandals off your feet, for the place where you are standing is holy ground.”