And God spoke all these words, saying, "I am Yahweh, your God, who brought you out from the land of Egypt, from the house of slaves. There shall be for you no other gods before me. You shall not make for yourself a divine image with any form that is in the heavens above or that is in the earth below or that is in the water below the earth. You will not bow down to them, and you will not serve them, because I am Yahweh your God, a jealous God, punishing the guilt of the parents on the children on the third and on the fourth generations of those hating me, and showing loyal love to thousands of generations of those loving me and of those keeping my commandments. "
Exodus 20:1-6 - LEB
The famous commandment against idolatry. I've searched and I see that the commandment against picturing forms above the heavens is directed at stopping the worship of other gods, and the one against picturing forms in the earth below would be directed at stopping worshiping the death. What about the "forms that are in the water below the earth"?
At first, Leviathan came to my mind, but that sea monster was in the seas, not in the water below the earth. Do we know of any tradition, either Israelite or of one of their neighbor nations, that had inhabitants in the water below the earth?