Exodus 20:23-25 New International Version - UK (NIVUK)
23 do 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 honoured, I will come to you and bless you. 25 If 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.