Exodus 3:3

1 Now Moses kept the flock of Jethro his father in law, the priest of Midian: and he led the flock to the backside of the desert, and came to the mountain of God, [even] to Horeb.

2 And the angel of the LORD appeared unto him in a flame of fire out of the midst of a bush: and he looked, and, behold, the bush burned with fire, and the bush [was] not consumed.

3 And Moses said, I will now turn aside, and see this great sight, why the bush is not burnt.

4 And when the LORD saw that he turned aside to see, God called unto him out of the midst of the bush, and said, Moses, Moses. And he said, Here [am] I.

5 And he said, Draw not nigh hither: put off thy shoes from off thy feet, for the place whereon thou standest [is] holy ground.

6 Moreover he said, I [am] the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob. And Moses hid his face; for he was afraid to look upon God.