1 Kings 22:12 KJV

And all the prophets prophesied so, saying, Go up to Ramothgilead, and prosper: for the LORD shall deliver it into the king's hand.

Jehoshaphat makes a league with AhabThe same easiness of temper, which betrays some godly persons into friendship with the declared enemies of religion, renders it very dangerous to them. They...

1 Kings 22:6–15 Then the king of Israel gathered the prophets together, about four hundred men, and said unto them, Shall I go against Ramothgilead to battle, or shall I forbear? And they said, Go up; for the Lord shall deliver it into the hand of the king. …
1 Kings 22:32–36 And it came to pass, when the captains of the chariots saw Jehoshaphat, that they said, Surely it is the king of Israel. And they turned aside to fight against him: and Jehoshaphat cried out. …
2 Chronicles 35:22 Nevertheless Josiah would not turn his face from him, but disguised himself, that he might fight with him, and hearkened not unto the words of Necho from the mouth of God, and came to fight in the valley of Megiddo.

From OpenBible.info, most relevant first.

Timeline of the Bible918–889 BC · Jehoshaphat reigns in Judah; Ahab and Ahaziah reign in Israel

Ramoth-gileadHeights of Gilead, a city of refuge on the east of Jordan; called “Ramoth in Gilead” (Deut 4:43; Josh 20:8; Josh 21:38). Here Ahab, who...
LordThere are various Hebrew and Greek words so rendered.

And all the prophets וְכָל wĕkol Noun · masculine singular construct · with and הַנְּבִאִים hannĕbiʾîm נָבִיא Noun · masculine plural · with the
prophesied נִבְּאִים nibbĕʾîm נָבָא Verb · niphal active participle, masculine plural
so, saying כֵּן kēn Demonstrative לֵאמֹר lēʾmōr אָמַר Verb · qal infinitive construct · with preposition
Go up עֲלֵה ʿălê עָלָה Verb · qal imperative, second person masculine singular
to Ramothgilead רָמֹת rāmōt רָמֹת גִּלעָד Proper name גִּלְעָד gilʿād גִּלְעָד Proper name
and prosper וְהַצְלַח wĕhaṣlaḥ צָלַח Verb · hiphil imperative, second person masculine singular · with and
for the LORD יְהוָה yhwh יְהֹוָה Proper name
shall deliver וְנָתַן wĕnātan נָתַן Verb · qal perfect, third person masculine singular · with and
into the king's הַמֶּלֶךְ hammelek מֶלֶךְ Noun · masculine singular · with the
hand בְּיַד bĕyad יָד Noun · masculine or feminine singular construct · with preposition

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