2 Kings 17:11, 15

There they burned incense on all the high places, just as the [pagan] nations whom the LORD had deported before them; and they did evil and contemptible things, provoking the LORD [to anger].

They rejected His statutes and His covenant which He made with their fathers, as well as His warnings that he gave them. And they followed vanity [that is, false gods, idols] and became vain (empty-headed). They followed the [pagan practices of the] nations which surrounded them, although the LORD had commanded that they were not to do as they did.