John Gills Exposition of the Bible Commentary - Deuteronomy 12:3
And you shall overthrow their altars ,.... Which were of stone, as Jarchi observes; whereas the altar ordered to be made by the Lord, before the altar of burnt offering in the tabernacle was made, was of earth, Exodus 20:24 these were to be demolished, lest the Israelites should be tempted to make use of them; and besides, the Lord would not have any remains of idolatry in the land where his tabernacle and worship were, as being abominable to him: and break down their pillars ; or... read more
Matthew Henry's Complete Commentary - Deuteronomy 12:1-4
From those great original truths, That there is a God, and that there is but one God, arise those great fundamental laws, That that God is to be worshipped, and he only, and that therefore we are to have no other God before him: this is the first commandment, and the second is a guard upon it, or a hedge about it. To prevent a revolt to false gods, we are forbidden to worship the true God in such a way and manner as the false gods were worshipped in, and are commanded to observe the instituted... read more