15 and he said, Listen, all Judah, and you inhabitants of Jerusalem, and you king Jehoshaphat: Thus says Yahweh to you, Don’t you be afraid, neither be dismayed by reason of this great multitude; for the battle is not yours, but God’s. 16 Tomorrow go down against them: behold, they come up by the ascent of Ziz; and you shall find them at the end of the valley, before the wilderness of Jeruel. 17 You shall not need to fight in this battle: set yourselves, stand still, and see the salvation of Yahweh with you, O Judah and Jerusalem; don’t be afraid, nor be dismayed: tomorrow go out against them: for Yahweh is with you.
Matthew Henry's Commentary on 2 Chronicles 20:15-17
Commentary on 2 Chronicles 20:14-19
(Read 2 Chronicles 20:14-19)
The Spirit of prophecy came upon a Levite in the midst of the congregation. The Spirit, like the wind, blows where and on whom He listeth. He encouraged them to trust in God. Let the Christian soldier go out against his spiritual enemies, and the God of peace will make him more than a conqueror. Our trials will prove our gain. The advantage will be all our own, but the whole glory must be given to God.