Acts 7:30-34

30“After forty years had passed, an angel appeared to Moses in the flames of a burning bush in the desert near Mount Sinai. 31When he saw this, he was amazed at the sight. As he went over to get a closer look, he heard the Lord say:

32‘I am the God of your fathers, the God of Abraham, Isaac and Jacob.’ Exodus 3:6 Moses trembled with fear and did not dare to look. 33“Then the Lord said to him, ‘Take off your sandals, for the place where you are standing is holy ground.

34I have indeed seen the oppression of my people in Egypt. I have heard their groaning and have come down to set them free. Now come, I will send you back to Egypt.’ Exodus 3:5,7,8,10