1 Kings 20:27-28

And the children of Israel were numbered, and were all present, and went against them: and the children of Israel pitched before them like two little flocks of kids; but the Syrians filled the country. 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.