2 Chronicles 20:15

15 And he said, "Hearken, all Judah and inhabitants of Jerusalem, and King Jehosh'aphat: Thus says the LORD to you, 'Fear not, and be not dismayed at 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 Meanwhile all the men of Judah stood before the LORD, with their little ones, their wives, and their children.

14 And the Spirit of the LORD came upon Jaha'ziel the son of Zechari'ah, son of Benai'ah, son of Je-i'el, son of Mattani'ah, a Levite of the sons of Asaph, in the midst of the assembly.

15 And he said, "Hearken, all Judah and inhabitants of Jerusalem, and King Jehosh'aphat: Thus says the LORD to you, 'Fear not, and be not dismayed at this great multitude; for the battle is not yours but God's.

16 Tomorrow go down against them; behold, they will come up by the ascent of Ziz; you will find them at the end of the valley, east of the wilderness of Jeru'el.

17 You will not need to fight in this battle; take your position, stand still, and see the victory of the LORD on your behalf, O Judah and Jerusalem.' Fear not, and be not dismayed; tomorrow go out against them, and the LORD will be with you."