2 Chronicles 20:15

15 And he said, “Listen, all you people of Judah and Jerusalem! Listen, King Jehoshaphat! This is what the LORD says: ‘Do not be afraid or discouraged because of this vast army, for the battle does not belong to you, but to God.

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, with their wives and children and little ones, were standing before the LORD.

14 Then the Spirit of the LORD came upon Jahaziel son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, a Levite from Asaph’s descendants, as he stood in the midst of the assembly.

15 And he said, “Listen, all you people of Judah and Jerusalem! Listen, King Jehoshaphat! This is what the LORD says: ‘Do not be afraid or discouraged because of this vast army, for the battle does not belong to you, but to God.

16 Tomorrow you are to march down against them. You will see them coming up the Ascent of Ziz, and you will find them at the end of the valley facing the Wilderness of Jeruel.

17 You need not fight this battle. Take up your positions, stand firm, and see the salvation of the LORD on your behalf, O Judah and Jerusalem. Do not be afraid or discouraged. Go out and face them tomorrow, for the LORD is with you.’”