New Revised Standard Version
He said, “Listen, all Judah and inhabitants of Jerusalem, and King Jehoshaphat: Thus says the LORD to you: ‘Do not fear or be dismayed at this great multitude; for the battle is not yours but God’s.

Contemporary English Version
Then Jahaziel said: Your Majesty and everyone from Judah and Jerusalem, the LORD says that you don't need to be afraid or let this powerful army discourage you. God will fight on your side!

New American Bible
and he said: “Pay attention, all of Judah, inhabitants of Jerusalem, and King Jehoshaphat! The LORD says to you: Do not fear or be dismayed at the sight of this vast multitude, for the battle is not yours but God’s.

Douay-Rheims Bible
And he said: Attend ye, all Juda, and you that dwell in Jerusalem, and thou king Josaphat: Thus saith the Lord to you: Fear ye not, and be not dismayed at this multitude: for the battle is not yours, but God's.

And he said: Attend ye, all Juda, and you that dwell in Jerusalem, and thou king Josaphat: Thus saith the Lord to you: Fear ye not, and be not dismayed at this multitude: for the battle is not yours, but God's.

Be not afraid

2 Chronicles 32:7,8 Behave like men, and take courage: be not afraid nor dismayed for the king of the Assyrians, nor for all the multitude that is with him: for there are many more with us than with him. . . .

Exodus 14:13,14 And Moses said to the people: Fear not: stand, and see the great wonders of the Lord, which he will do this day; for the Egyptians, whom you see now, you shall see no more for ever. . . .

Deuteronomy 1:29,30 And I said to you: Fear not, neither be ye afraid of them: . . .

Deuteronomy 20:1,4 If thou go out to war against thy enemies, and see horsemen and chariots, and the numbers of the enemy's army greater than thine, thou shalt not fear them: because the Lord thy God is with thee, who brought thee out of the land of Egypt. . . .

Deuteronomy 31:6,8 Do manfully and be of good heart: fear not, nor be ye dismayed at their sight: for the Lord thy God he himself is thy leader, and will not leave thee nor forsake thee. . . .

Joshua 11:6 And the Lord said to Joshua: Fear them not: for to morrow at this same hour I will deliver all these to be slain in the sight of Israel: thou shalt hamstring their horses, and thou shalt burn their chariots with fire.

Nehemiah 4:14 And I looked and rose up: and I said to the chief men and the magistrates, and to the rest of the common people: be not afraid of them. Remember the Lord who is great and terrible, and fight for your brethren, your sons, and your daughters, and your wives, and your houses.

Psalm 17:1,2 The prayer of David. Hear, O Lord, my justice: attend to my supplication. Give ear unto my prayer, which proceedeth not from deceitful lips. . . .

Isaiah 41:10-16 Fear not, for I am with thee: turn not aside, for I am thy God: I have strengthened thee, and have helped thee, and the right hand of my just one hath upheld thee. . . .

Isaiah 43:1,2 And now thus saith the Lord that created thee, O Jacob, and formed thee, O Israel: Fear not, for I have redeemed thee, and called thee by thy name: thou art mine. . . .

the battle

2 Chronicles 32:8 For with him is an arm of flesh: with us the Lord our God, who is our helper, and fighteth for us. And the people were encouraged with these words of Ezechias king of Juda.

1 Samuel 17:47 And all this assembly shall know that the Lord saveth not with sword and spear: for it is his battle, and he will deliver you into our hands.