The Lord said not, i.e. not yet; he had not yet declared this, as afterwards he did by the succeeding prophets, though not in those words. See Hosea 1:5,6,9.
Related Commentaries of 2 Kings 14:27
2 Kings 14:27
27 And the LORD said not that he would blot out the name of Israel from under heaven: but he saved them by the hand of Jeroboam the son of Joash.