2 Chronicles 20:15

15 and he said, Listen you, all Yehudah, and you inhabitants of Yerushalayim, and you king Yehoshafat: Thus says the LORD to you, Don't be afraid you, neither be dismayed by reason of this great multitude; for the battle is not yours, but God's.

2 Chronicles 20:15 Meaning and Commentary

2 Chronicles 20:15

And he said, hearken ye, all Judah, and ye inhabitants of
Jerusalem, and thou King Jehoshaphat
There is a climax or gradation in these words rising from the lowest to the highest; from the people of the cities in the country, to the inhabitants of Jerusalem the metropolis, and from thence to the king the supreme governor: thus saith the Lord unto you, be not afraid, nor dismayed, by reason of
this great multitude;
whose numbers were discouraging to the king, and he had taken notice of them, which this respects: for the battle is not your's, but God's:
the cause was his, and he would espouse and maintain it; not they, but he, would fight the battle, and therefore they had nothing to fear.

2 Chronicles 20:15 In-Context

13 All Yehudah stood before the LORD, with their little ones, their wives, and their children.

14 Then on Yachazi'el the son of Zekharyah, the son of Benayah, the son of Ye`i'el, the son of Mattanyah, the Levite, of the sons of Asaf, came the Spirit of the LORD in the midst of the assembly;

15 and he said, Listen you, all Yehudah, and you inhabitants of Yerushalayim, and you king Yehoshafat: Thus says the LORD to you, Don't be afraid you, neither be dismayed by reason of this great multitude; for the battle is not yours, but God's.

16 Tomorrow go you down against them: behold, they come up by the ascent of Tzitz; and you shall find them at the end of the valley, before the wilderness of Yeru'el.

17 You shall not need to fight in this [battle]: set yourselves, stand you still, and see the salvation of the LORD with you, O Yehudah and Yerushalayim; don't be afraid, nor be dismayed: tomorrow go out against them: for the LORD is with you.