2 Chronicles 20:15

20:15 and he said, Listen you, all Judah, and you inhabitants of Jerusalem, and you king Jehoshaphat: Thus says Yahweh to you, Don't be afraid you, neither be dismayed by reason of this great multitude; for the battle is not yours, but God's.
-World English Bible

Other Translation

20:15 And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat, Thus saith the LORD unto you, Be not afraid nor dismayed by reason of this great multitude; for the battle [is] not yours, but God's.
-King James Version