Exodus 20:22-26

22Then the Lord said to Moses, “Tell the Israelites this: ‘You have seen for yourselves that I have spoken to you from heaven:

23Do not make any gods to be alongside me; do not make for yourselves gods of silver or gods of gold.

24“ ‘Make an altar of earth for me and sacrifice on it your burnt offerings and fellowship offerings, your sheep and goats and your cattle. Wherever I cause my name to be honored, I will come to you and bless you.

25If you make an altar of stones for me, do not build it with dressed stones, for you will defile it if you use a tool on it.

26And do not go up to my altar on steps, or your private parts may be exposed.’