Acts 7:30-33

“Forty years later an angel appeared to Moses in the flames of a burning bush as he was in the desert near Mount Sinai. When Moses saw this, he was amazed and went near to look closer. Moses heard the Lord’s voice say, ‘I am the God of your ancestors, the God of Abraham, Isaac, and Jacob.’ Moses began to shake with fear and was afraid to look. The Lord said to him, ‘Take off your sandals, because you are standing on holy ground.