Acts 7:30-33

7:30 “After forty years had passed, an angel appeared to him in the desert of Mount Sinai, in the flame of a burning bush. 7:31 When Moses saw it, he was amazed at the sight, and when he approached to investigate, there came the voice of the Lord, 7:32 ‘I am the God of your forefathers, the God of Abraham, Isaac, and Jacob.’ Moses began to tremble and did not dare to look more closely. 7:33 But the Lord said to him, ‘Take the sandals off your feet, for the place where you are standing is holy ground.