2 Chronicles 20:15

15 and he said, All Judah, and ye that dwell in Jerusalem, and thou, king Jehoshaphat, perceive ye, or taketh heed, The Lord saith these things to you, Do not ye dread, neither be ye afeared of this multitude, for it is not your battle, but God's battle. (and he said, All Judah, and ye who live in Jerusalem, and thou, king Jehoshaphat, take heed, The Lord saith these things to you, Do not ye fear, nor be ye afraid of this multitude, for it is not your battle, but God's battle.)

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 And all Judah stood before the Lord, with their little children, and their wives, and with their free children.

14 And Jahaziel, the son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, was a deacon, and of the sons of Asaph, upon whom the Spirit of the Lord was made in the midst of the company, (And Jahaziel, the son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, was a Levite of the sons of Asaph, upon whom the Spirit of the Lord came in the middle of the congregation,)

15 and he said, All Judah, and ye that dwell in Jerusalem, and thou, king Jehoshaphat, perceive ye, or taketh heed, The Lord saith these things to you, Do not ye dread, neither be ye afeared of this multitude, for it is not your battle, but God's battle. (and he said, All Judah, and ye who live in Jerusalem, and thou, king Jehoshaphat, take heed, The Lord saith these things to you, Do not ye fear, nor be ye afraid of this multitude, for it is not your battle, but God's battle.)

16 Tomorrow ye shall go up against them; for they shall go up by the side of the hill, called Ziz by name, and ye shall find them in the height of the strand, that is against the wilderness of Jeruel. (Tomorrow ye shall go out against them; for they shall go up by the Ziz Pass, and ye shall find them at the end of the valley, east of the wilderness of Jeruel.)

17 For it shall not be ye, that shall fight; but only stand ye trustily (For it shall not be ye, who shall fight; but only stand ye there with trust/in faith), and ye shall see the help of the Lord upon you. O! Judah and Jerusalem, do not ye dread, neither be ye afeared; tomorrow ye shall go out against them, and the Lord shall be with you.