Exodus 20:25
And if you make an altar of stones for me, you will not build them [as] hewn stone, because if you use your chisel on it, you have defiled it.
Deuteronomy 27:5-6
And you shall build an altar there for Yahweh your God, an altar of stone, but {you shall not use an iron tool to shape the stones}.
Joshua 8:31
as Moses Yahweh's servant commanded the {Israelites}, as [it is] written in the scroll of the law of Moses: "an altar of unhewn stones [on] which no one has {wielded} an iron implement." And they offered burnt offerings on it and sacrificed fellowship 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 you shall build an altar there for Yahweh your God, an altar of stone, but {you shall not use an iron tool to shape the stones}.
Joshua 8:31
as Moses Yahweh's servant commanded the {Israelites}, as [it is] written in the scroll of the law of Moses: "an altar of unhewn stones [on] which no one has {wielded} an iron implement." And they offered burnt offerings on it and sacrificed fellowship offerings.
General references
Leviticus 16:33
and he shall make atonement for the sanctuary's holy place, and he shall make atonement for [the] tent of assembly and the altar, and he shall make atonement for the priests and for all of the assembly's people.