Exodus 20:25
And if thou make me an altar of stone, thou shalt not build it of hewn stone; for if thou lift up thy sharp tool upon it, thou hast profaned it.
Deuteronomy 27:5-6
And there shalt thou build an altar to Jehovah thy God, an altar of stones; thou shalt not lift up an iron tool upon them;
Joshua 8:31
as Moses the servant of Jehovah had commanded the children of Israel, as it is written in the book of the law of Moses, an altar of whole stones, over which iron had not been lifted up. And they offered up burnt-offerings on it to Jehovah, 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
And there shalt thou build an altar to Jehovah thy God, an altar of stones; thou shalt not lift up an iron tool upon them;
Joshua 8:31
as Moses the servant of Jehovah had commanded the children of Israel, as it is written in the book of the law of Moses, an altar of whole stones, over which iron had not been lifted up. And they offered up burnt-offerings on it to Jehovah, and sacrificed peace-offerings.
General references
Leviticus 16:33
And he shall make atonement for the holy sanctuary; and for the tent of meeting, and for the altar shall he make atonement; and for the priests, and for the whole people of the congregation shall he make atonement.