Deuteronomy 4:15-18

“But be very careful! You did not see the LORD’s form on the day he spoke to you from the heart of the fire at Mount Sinai. So do not corrupt yourselves by making an idol in any form—whether of a man or a woman, an animal on the ground, a bird in the sky, a small animal that scurries along the ground, or a fish in the deepest sea.