For the Lord thy God, i.e. for the satisfaction of God's justice, the maintenance of his honour and authority and laws, and the pacification of his offended majesty. It shall be an heap for ever; it shall be an eternal monument of God's justice, and terror to after-ages, who may be tempted to like practices.
Related Commentaries of Deuteronomy 13:16
Deuteronomy 13:16
16 And thou shalt gather all the spoil of it into the midst of the street thereof, and shalt burn with fire the city, and all the spoil thereof every whit, for the LORD thy God: and it shall be an heap for ever; it shall not be built again.