Exodus 3:2-5

2The Messenger of the Lord appeared to him there as flames of fire coming out of a bush. Moses looked, and although the bush was on fire, it was not burning up.

3So he thought, “Why isn’t this bush burning up? I must go over there and see this strange sight.”

4When the Lord saw that Moses had come over to see it, God called to him from the bush, “Moses, Moses!” Moses answered, “Here I am!”

5God said, “Don’t come any closer! Take off your sandals because this place where you are standing is holy ground.