Exodus 20:25

But if, an altar of stones, thou wilt make to me, thou shalt not build them hewn, - for as soon as thou hast lifted, thy sharp tool, thereupon, thou hast profaned it;

Deuteronomy 27:5-6

And thou shalt build there an altar unto Yahweh thy God, - an altar of stones, thou shalt not wield thereupon any tool of iron.

Joshua 8:31

as Moses, the servant of Yahweh, commanded the sons of Israel, as it is written in the scroll of the law of Moses, an altar of whole stones, whereon had not been wielded any tool of iron, - and they caused to go up thereon, ascending-sacrifices unto 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
And thou shalt build there an altar unto Yahweh thy God, - an altar of stones, thou shalt not wield thereupon any tool of iron.
Joshua 8:31
as Moses, the servant of Yahweh, commanded the sons of Israel, as it is written in the scroll of the law of Moses, an altar of whole stones, whereon had not been wielded any tool of iron, - and they caused to go up thereon, ascending-sacrifices unto Yahweh, and sacrificed peace-offerings.

General references

Leviticus 16:33
And make propitiation for the holy sanctuary, And for the tent of meeting, and for the altar, shall he make propitiation, - Over the priests also and over all the people of the convocation, shall he put a covering by propitiation.