John Gill's  Exposition of the Bible 

1 Kings 18:6

So they divided the land between them to pass throughout it: Ahab went one way by himself, and Obadiah went another way by himself.

So they divided the land between them, to pass through it,.... And one took one part, and the other the other part:

Ahab went one way by himself, and Obadiah went another way by himself; Ahab not caring to trust any but Obadiah, who he knew was a faithful man, lest they should be bribed by those that had grass not to discover it.