Because the Syrians have said; which he knew, either by common report, strengthened by their present choice of a plain ground for the battle; or rather, by revelation from God, who discovered their secret counsels, 2 Kings 6:12. I am the Lord, to wit, the universal Lord of all places, and persons, and things.
Related Commentaries of 1 Kings 20:28
1 Kings 20:28
28 And there came a man of God, and spake unto the king of Israel, and said, Thus saith the LORD, Because the Syrians have said, The LORD is God of the hills, but he is not God of the valleys, therefore will I deliver all this great multitude into thine hand, and ye shall know that I am the LORD.