Deuteronomy 4:15-18

The Nature of Israel’s God

4:15 Be very careful, then, because you saw no form at the time the Lord spoke to you at Horeb from the middle of the fire. 4:16 I say this so you will not corrupt yourselves by making an image in the form of any kind of figure. This includes the likeness of a human male or female, 4:17 any kind of land animal, any bird that flies in the sky, 4:18 anything that crawls on the ground, or any fish in the deep waters of the earth.

Deuteronomy 4:33

4:33 Have a people ever heard the voice of God speaking from the middle of fire, as you yourselves have, and lived to tell about it?