Commentaries:
Elijah is declaring himself as one sent from God. A prophet will always have the law of God at the foundation of his message.
John W. Ritenbaugh
Prophets and Prophecy (Part One)
Revelation 11:10 says that the Two Witnesses will torment the people of the earth, which is why the world will celebrate when these prophets are finally killed. Here, Elijah was thought of in the same way, as a "troubler" of Israel.
Richard T. Ritenbaugh
The Two Witnesses (Part Six)
Other Forerunner Commentary entries containing 1 Kings 18:17:
Amos 3:13-14