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. … 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.'”

2 Chronicles 20:15,17 New International Version