Acts 7:30-34

30And when forty years were fulfilled, an angel appeared to him in the wilderness of mount Sinai, in a flame of fire in a bush. 31And when Moses saw it, he wondered at the sight: and as he drew near to behold, there came a voice of the Lord, 32I am the God of thy fathers, the God of Abraham, and of Isaac, and of Jacob. And Moses trembled, and durst not behold. 33And the Lord said unto him, Loose the shoes from thy feet: for the place whereon thou standest is holy ground. 34I have surely seen the affliction of my people that is in Egypt, and have heard their groaning, and I am come down to deliver them: and now come, I will send thee into Egypt.