Chronicles II 20:15

15 and he said, Hear ye, all Juda, and the dwellers in Jerusalem, and king Josaphat: Thus saith the Lord to you, even you, Fear not, neither be alarmed, before all this great multitude; for the battle is not years, but God's.

Chronicles II 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.

Chronicles II 20:15 In-Context

13 And all Juda was standing before the Lord, and their children, and their wives.

14 And Oziel the of Zacharias, of the children of Banaias, of the sons of Eleiel, the sons of Matthanias the Levite, of the sons of Asaph, —upon him came the Spirit of the Lord in the assembly:

15 and he said, Hear ye, all Juda, and the dwellers in Jerusalem, and king Josaphat: Thus saith the Lord to you, even you, Fear not, neither be alarmed, before all this great multitude; for the battle is not years, but God's.

16 To-morrow go ye down against them: behold, they come up by the ascent of Assis, and ye shall find them at the extremity of the river of the wilderness of Jeriel.

17 It is not for you to fight: understand these things, and see the deliverance of the Lord with you, Juda and Jerusalem: fear not, neither be afraid to go forth to-morrow to meet them; and the Lord shall be with you.