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.

And he answered him, I am: go, tell thy lord, Behold, Elijah is here.

18:8 Thy lord - Ahab: whom, though a very wicked man, he owns for Obadiah's Lord and king; thereby instructing us, that the wickedness of kings doth not exempt their subjects from obedience to their lawful commands.

18:1-16 The severest judgments, of themselves, will not humble or change the hearts of sinners; nothing, except the blood of Jesus Christ, can atone for the guilt of sin; nothing, except the sanctifying Spirit of God, can purge away its pollution. The priests and the Levites were gone to Judah and Jerusalem, 2Ch 11:13,14, but instead of them God raised up prophets, who read and expounded the word. They probably were from the schools of the prophets, first set up by Samuel. They had not the spirit of prophecy as Elijah, but taught the people to keep close to the God of Israel. These Jezebel sought to destroy. The few that escaped death were forced to hide themselves. God has his remnant among all sorts, high and low; and that faith, fear, and love of his name, which are the fruits of the Holy Spirit, will be accepted through the Redeemer. See how wonderfully God raises up friends for his ministers and people, for their shelter in difficult times. Bread and water were now scarce, yet Obadiah will find enough for God's prophets, to keep them alive. Ahab's care was not to lose all the beasts; but he took no care about his soul, not to lose that. He took pains to seek grass, but none to seek the favour of God; fencing against the effect, but not inquiring how to remove the cause. But it bodes well with a people, when God calls his ministers to stand forth, and show themselves. And we may the better endure the bread of affliction, while our eyes see our teachers.