Deuteronomy 27:6

Of whole stones shall you build an altar to the Lord your God, and you shall offer upon it whole burnt offerings to the Lord your God.

Thou shalt build the altar of the Lord thy God of whole stones: and thou shalt offer burnt offerings thereon unto the Lord thy God:

You shall build Yahweh your God’s altar of uncut stones. You shall offer burnt offerings on it to Yahweh your God.