He shall know ... Israel - namely, “That which thou (the king of Israel) appearest to have forgotten, that there is a prophet - a real Yahweh prophet - in Israel.”
Related Commentaries of 2 Kings 5:8
2 Kings 5:8
8 And it was so, when Elisha the man of God had heard that the king of Israel had rent his clothes, that he sent to the king, saying, Wherefore hast thou rent thy clothes? let him come now to me, and he shall know that there is a prophet in Israel.