Albert Barnes Commentary 2 Kings 5:8

"And it was so, when Elisha the man of God 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." — 2 Kings 5:8 (ASV)

He shall know ... Israel—namely, what you (the king of Israel) appear to have forgotten: that there is a prophet, a real prophet of Yahweh, in Israel.