Deuteronomy 12:2-4

2Destroy completely all the places on the high mountains, on the hills and under every spreading tree, where the nations you are dispossessing worship their gods.

3Break down their altars, smash their sacred stones and burn their Asherah poles in the fire; cut down the idols of their gods and wipe out their names from those places. 4You must not worship the LORD your God in their way.