Charles Ellicott Commentary 2 Chronicles 18:4

"And Jehoshaphat said unto the king of Israel, Inquire first, I pray thee, for the word of Jehovah." — 2 Chronicles 18:4 (ASV)

And Jehoshaphat. — This is exactly as in 1 Kings 22:5.

Inquire ... at the word. — Seek the word.