Used to show that the Angel of the Lord appears in the bush yet the speaker is identified as God, supporting plurality within the identity of Yahweh in the Old Testament.
bible
2 The angel of Yahweh appeared to him in a flame of fire out of the midst of a bush. He looked, and behold, the bush burned with fire, and the bush was not consumed. 3 Moses said, I will turn aside now, and see this great sight, why the bush is not burnt. 4 When Yahweh saw that he turned aside to see, God called to him out of the midst of the bush, and said, "Moses! Moses!" He said, "Here I am." 5 He said, "Don't come close. Take off your sandals from off your feet, for the place you are standing on is holy ground." 6 Moreover he said, "I am the God of your father, the God of Abraham, the God of Isaac, and the God of Jacob." Moses hid his face; for he was afraid to look at God.
The host directed a Muslim caller to the burning bush passage to argue that the angel of Yahweh is identified as God/Yahweh, supporting plurality within the one God.