Exodus 3:1-5 (CEB)
3 Moses was taking care of the flock for his father-in-law Jethro,[a]Midian’s priest. He led his flock out to the edge of the desert, and he came to God’s mountain called Horeb. 2 The Lord’s messenger appeared to him in a flame of fire in the middle of a bush. Moses saw that the bush was in flames, but it didn’t burn up. 3 Then Moses said to himself, Let me check out this amazing sight and find out why the bush isn’t burning up.
4 When the Lord saw that he was coming to look, God called to him out of the bush, “Moses, Moses!”
Moses said, “I’m here.”
5 Then the Lord said, “Don’t come any closer! Take off your sandals, because you are standing on holy ground.”