Exodus 20:25

If you make me an altar of stone, you shall not build it of cut stones; for if you lift up your tool on it, you have polluted it.

Deuteronomy 27:5-6

There you shall build an altar to Yahweh your God, an altar of stones: you shall lift up no iron [tool] on them.

Joshua 8:31

as Moses the servant of Yahweh commanded the children of Israel, as it is written in the book of the law of Moses, an altar of uncut stones, on which no man had lifted up any iron. They offered burnt offerings on it to Yahweh, and sacrificed peace offerings.

Treasury of Scripture Knowledge

Summary

And if thou wilt make me an altar of stone, thou shalt not build it of hewn stone: for if thou lift up thy tool upon it, thou hast polluted it.

General references

Bible References

And

Deuteronomy 27:5
There you shall build an altar to Yahweh your God, an altar of stones: you shall lift up no iron [tool] on them.
Joshua 8:31
as Moses the servant of Yahweh commanded the children of Israel, as it is written in the book of the law of Moses, an altar of uncut stones, on which no man had lifted up any iron. They offered burnt offerings on it to Yahweh, and sacrificed peace offerings.

General references

Leviticus 16:33
Then he shall make atonement for the Holy Sanctuary; and he shall make atonement for the Tent of Meeting and for the altar; and he shall make atonement for the priests and for all the people of the assembly.