2 Kings 17:25, 27-28, 33

Now when they began to live there, they did not fear the LORD; therefore the LORD sent lions among them which killed some of them.

Then the king of Assyria commanded, “Take back [to Samaria] one of the priests whom you brought from there, and have him go and live there; and have him teach the people the custom of the god of the land.” So one of the priests whom they had exiled from Samaria came [back] and lived in Bethel and taught them how they should fear [and worship] the LORD.

They feared the LORD, yet served their own gods, following the custom of the nations from among whom they had been sent into exile.