But Jehoshaphat also said to the king of Israel, “Please inquire first for the word of the LORD.”
This is almost word for word the same with what we had, 1 Kings 22. We will not repeat what was there said, nor have we much to add, but may take occasion to think, 1. Of the great duty of acknowledging God in all our ways and enquiring at his word, whatever we undertake. Jehoshaphat was not willing to proceed till he had done this, Ch2 18:4.
Commenting on 2 Chronicles 18:4-27
And Jehoshaphat said unto the king of Israel, Enquire, I pray thee, at the word of the LORD to day. (d) Hear the advise of some prophet to know whether it is God's will.
2Ch 18:2-34 The campaign undertaken along with Ahab against the Syrians at Ramoth in Gilead, with its origin, course, and results for Ahab, is narrated in 1 Kings (in the history of Ahab) in agreement with our narrative, only the introduction to the war being different here.
Commenting on 2 Chronicles 18:2-34