24You are to make for Me an altar of earth, and sacrifice on it your burnt offerings and peace offerings, your sheep and goats and cattle. In every place where I cause My name to be remembered, I will come to you and bless you.
25Now if you make an altar of stones for Me, you must not build it with stones shaped by tools; for if you use a chisel on it, you will defile it.
— Exodus 20:24-25

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Devo: Morning & Evening

"God's altar was to be built of unhewn stones, that no trace of human skill or labour might be seen upon it. Human wisdom delights to trim and arrange...."