2 Kings 17:25, 27-28, 33

But since these foreign settlers did not worship the LORD when they first arrived, the LORD sent lions among them, which killed some of them.

The king of Assyria then commanded, “Send one of the exiled priests back to Samaria. Let him live there and teach the new residents the religious customs of the God of the land.” So one of the priests who had been exiled from Samaria returned to Bethel and taught the new residents how to worship the LORD.

And though they worshiped the LORD, they continued to follow their own gods according to the religious customs of the nations from which they came.