1 Kings 18:8

And he answered him, I am
He did not desire to be concealed, his orders were to show and make himself known to Ahab, and Obadiah was one of his domestic servants: go tell thy lord, behold, Elijah is here;
in such a place, ready to face him at any time. Elijah, by calling Ahab the lord of Obadiah, as he tacitly reproves him for calling him lord, shows reverence to Ahab as a king, and yet that he was fearless of him, as he was the prophet and ambassador of the Lord of hosts to him.