Exodus 3:2-6

3:2 The 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! 3:3 So Moses thought, “I will turn aside to see this amazing sight. Why does the bush not burn up?” 3:4 When 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.” 3:5 God said, “Do not approach any closer! Take your sandals off your feet, for the place where you are standing is holy ground.” 3:6 He added, “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.