For the battle is not yours, but God's

2 Chronicles 20:6, 15-17

(New International Version)

6 and said:
"O LORD, God of our fathers, are you not the God who is in heaven? You rule over all the kingdoms of the nations. Power and might are in your hand, and no one can withstand you.

15 He said: "Listen, King Jehoshaphat and all who live in Judah and Jerusalem!
This is what the LORD says to you: 'Do not be afraid or discouraged because of this vast army. For the battle is not yours, but God's.

16 Tomorrow march down against them. They will be climbing up by the Pass of Ziz, and you will find them at the end of the gorge in the Desert of Jeruel.

17 You will not have to fight this battle. Take up your positions; stand firm and see the deliverance the LORD will give you, O Judah and Jerusalem. Do not be afraid; do not be discouraged. Go out to face them tomorrow, and the LORD will be with you.' "