2 Chronicles 20:15–17

A word to Judah in YHWH’s name: the war is not theirs, but Elohim’s

15and he said, “Listen, all Judah and inhabitants of Jerusalem, and King Jehoshaphat: Thus says YHWH to you: ‘You, do not be afraid and do not be dismayed before this great multitude, for the war is not yours, but Elohim’s.

16Tomorrow go down against them; look, they are coming up by the ascent of Ziz, and you will find them at the end of the brook, facing the wilderness of Jeruel.

17It is not for you to fight in this; present yourselves, stand and see the salvation of YHWH with you, Judah and Jerusalem. Do not be afraid and do not be dismayed; tomorrow go out before them, and YHWH will be with you.’”

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In its context

13And all Judah was standing before YHWH, also their little ones, their wives and their sons.

14Then upon Jahaziel son of Zechariah, son of Benaiah, son of Jeiel, son of Mattaniah, the Levite, of the sons of Asaph, the spirit of YHWH came in the midst of the assembly,

…

18Jehoshaphat bowed with his face to the ground, and all Judah and the inhabitants of Jerusalem fell before YHWH, to bow down to YHWH.

19The Levites, of the sons of the Kohathites and of the sons of the Korahites, stood up to praise YHWH, Elohim of Israel, with a voice exceedingly loud.

Read all of 2 Chronicles 20

Its words in the original

Courage