What does 1 Kings 18:10 mean?

As surely as the Lord your God lives, there's no nation or kingdom where my master hasn't sent people to look for you. And when they said you weren't there, he made them swear they hadn't found you. 1 Kings 18:10 - Modern Text Bible

(Obadiah explains how desperately Ahab has been searching for Elijah, even making other nations swear they don't know where he is.)