Bible Verses About Altars: To be made of earth, or unhewn stone

For me you need make only an altar of earth; on it you will sacrifice your burnt offerings, peace offerings, sheep, goats and cattle. In every place where I cause my name to be mentioned, I will come to you and bless you.

If you do make me an altar of stone, you are not to build it of cut stones; for if you use a tool on it, you profane it.

There you are to erect an altar to ADONAI your God, an altar made of stones. You are not to use any iron tool on them,

but are to build the altar of ADONAI your God of uncut stones; and you are to offer burnt offerings on it to ADONAI your God.