'I Am the Lord' in the Bible

Then a prophet approached Ahab king of Israel and said, “Thus says the Lord: ‘Have you seen all this great army? Behold, I will hand them over to you, and you shall know [without any doubt] that I am the Lord.’”

A man of God approached and said to the king of Israel, “Thus says the Lord, ‘Because the Arameans have said, “The Lord is a god of the hills, but He is not a god of the valleys,” I will give this great army into your hand, and you shall know [by experience] that I am the Lord.’”