Deuteronomy 27:5

The English Standar Version

And there you shall build an altar to the LORD your God, an altar of stones. You shall wield no iron tool on them;

Cross References

1 Kings 6:7

When the house was built, it was with stone prepared at the quarry, so that neither hammer nor axe nor any tool of iron was heard in the house while it was being built.

Exodus 20:25

If you make me an altar of stone, you shall not build it of hewn stones, for if you wield your tool on it you profane it.

Exodus 24:4

And Moses wrote down all the words of the LORD. He rose early in the morning and built an altar at the foot of the mountain, and twelve pillars, according to the twelve tribes of Israel.

Deuteronomy 27:6

you shall build an altar to the LORD your God of uncut[1] stones. And you shall offer burnt offerings on it to the LORD your God,