Matthew Henry on 2 Chronicles 18:28–end
We have here, 1. Good Jehoshaphat exposing himself in his robes, thereby endangered, and yet delivered. We have reason to think that Ahab, while he pretended friendship, really aimed at Jehoshaphat's life, to take him off, that he might have the management of his successor, who was his son-in-law, else he would never have advised him to enter into the battle with his robes on, which was but to make himself an easy mark to the enemy: and, if really he intended that, it was as unprincipled a piece of treachery as ever man was guilty of, and justly was he himself taken in the pit he digged for his friend. The enemy had soon an eye upon the robes, and vigorously attacked the unwary prince who no…
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Then there came out a spirit - The Targum gives a strange gloss here: "Then the spirit of Naboth of Jezreel came out from the abode of the righteous, and stood before the Lord, and said, I will deceive him. And the Lord said, By what means? To which he answered, I will be a spirit of false prophecy in the mouth of his prophets. And the Lord said, Thou mayest then. But although the power of deceiving them is given unto thee, nevertheless it will not be lawful for thee to sit among the righteous; for whosoever shall speak falsely cannot have a mansion among the righteous. Therefore go forth from me, and do as thou hast said." - Targum.
John Gill on 2 Chronicles 18:2
And after certain years,.... Two years, according to the Syriac and Arabic versions, or in the third year after the affinity was contracted, see 1 Kings 22:2,
he went down to Ahab to Samaria; to pay him a visit upon the alliance, civil and matrimonial, contracted between them:
and Ahab killed sheep and oxen for him in abundance, and for the people that he had with him; entertained him and his retinue in a very grand and liberal manner:
and persuaded him to go up with him to Ramothgilead; from hence, to the end of the chapter, it is the same with 1 Kings 22:4.
Tyndale Open Study Notes on 2 Chronicles 18:28-34