Acts 7:30-34

30After forty years had passed, an angel appeared to him in the wilderness of Mount Sinai, in the flame of a burning bush.

31When Moses saw it, he was amazed at the sight. As he was approaching to look at it, the voice of the Lord came:

32I am the God of your ancestors — the God of Abraham, of Isaac, and of Jacob. Moses began to tremble and did not dare to look.

33“The Lord said to him: Take off the sandals from your feet, because the place where you are standing is holy ground.

34I have certainly seen the oppression of my people in Egypt; I have heard their groaning and have come down to set them free. And now, come, I will send you to Egypt.