2 Kings 17:26
Wherefore they spake to the king of Assyria, saying, The nations which thou hast removed, and placed in the cities of Samaria, know not the manner of the God of the land: therefore he hath sent lions among them, and, behold, they slay them, because they know not the manner of the God of the land.
Cross-reference
2 Kings 17:24
Historical context
2 Kings 17:24 provides the background: Assyria resettled foreigners in Samaria — these are the nations who don't know God's ritual in verse 26.
2 Kings 17:27
Historical context
2 Kings 17:27 records the king's response: send a priest to teach the ritual — the direct sequel to the report in verse 26.