2 Chronicles 20:15

15 Jahaziel said, "Pay attention to me, everyone from Judah, everyone living in Jerusalem, and King Jehoshaphat. This is what the LORD says to you: Don't be frightened or terrified by this large crowd. The battle isn't yours. It's 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 the people from Judah, their infants, wives, and children were standing in front of the LORD.

14 Then the LORD's Spirit came to Jahaziel. (He was the son of Zechariah, grandson of Benaiah, great-grandson of Jeiel, whose father was Mattaniah, a Levite descended from Asaph.)

15 Jahaziel said, "Pay attention to me, everyone from Judah, everyone living in Jerusalem, and King Jehoshaphat. This is what the LORD says to you: Don't be frightened or terrified by this large crowd. The battle isn't yours. It's God's.

16 Tomorrow go into battle against them. They will be coming up the Ziz Pass. You will find them at the end of the valley in front of the Jeruel Desert.

17 You won't fight this battle. [Instead,] take your position, stand still, and see the victory of the LORD for you, Judah and Jerusalem. Don't be frightened or terrified. Tomorrow go out to face them. The LORD is with you."