'I Am the Lord' in the Bible

And, behold, there came a prophet unto Ahab king of Israel, saying, Thus says the LORD, Have you seen all this great multitude? behold, I will deliver it into your hand this day; and you shall know that I am the LORD.

And there came a man of God, and spoke unto the king of Israel, and said, Thus says 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 your hand, and you shall know that I am the LORD.