Acts 7:30-34
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.
7:34 I have certainly seen the suffering of my people who are in Egypt and have heard their groaning, and I have come down to rescue them. Now come, I will send you to Egypt.’