15 And he said, "Hearken, all Judah and inhabitants of Jerusalem, and King Jehosh'aphat: Thus says the Lord to you, 'Fear not, and be not dismayed at this great multitude; for the battle is not yours but God's. 16 Tomorrow go down against them; behold, they will come up by the ascent of Ziz; you will find them at the end of the valley, east of the wilderness of Jeru'el. 17 You will not need to fight in this battle; take your position, stand still, and see the victory of the Lord on your behalf, O Judah and Jerusalem.' Fear not, and be not dismayed; tomorrow go out against them, and the Lord will be 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.