Deuteronomy 12:29-31

29When the LORD thy God shall cut off the nations from before thee, whither thou goest in to possess them, and thou possessest them, and dwellest in their land;

30take heed to thyself that thou be not ensnared to follow them, after that they be 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.

31Thou shalt not do so unto the LORD thy God: for every abomination to the LORD, which he hateth, have they done unto their gods; for even their sons and their daughters do they burn in the fire to their gods.