Albert Barnes Commentary Deuteronomy 12:30

"take heed to thyself that thou be not ensnared to follow them, after that they are destroyed from before thee; and that thou inquire not after their gods, saying, How do these nations serve their gods? even so will I do likewise." — Deuteronomy 12:30 (ASV)

This caution is based upon the notion generally entertained in the ancient pagan world, that each country had its own tutelary deities whom it would be perilous to neglect; compare 1 Kings 20:23; 2 Kings 17:26. Israel was to shun such superstitions as unworthy of the elect people of God.