2 Chronicles 20:15

and he said, Be attentive, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat! Thus saith Jehovah unto you: Fear not, nor be dismayed by reason of this great multitude; for the battle is not yours, but God's.

1 Samuel 17:47

and all this congregation shall know that Jehovah saves not with sword and spear; for the battle is Jehovah's, and he will give you into our hands.

2 Chronicles 32:7-8

Be strong and courageous, be not afraid nor dismayed for the king of Assyria, nor for all the multitude that is with him; for there are more with us than with him:

Exodus 14:13-14

And Moses said to the people, Fear not: stand still, and see the salvation of Jehovah, which he will work for you to-day; for the Egyptians whom ye have seen to-day, ye shall see them again no more for ever.

Deuteronomy 1:29-30

And I said unto you, Be not afraid, neither fear them;

Deuteronomy 20:1

When thou goest out to war against thine enemies, and seest horses, and chariots, and a people more numerous than thou, thou shalt not fear them; for Jehovah thy God is with thee, who brought thee up out of the land of Egypt.

Deuteronomy 20:4

for Jehovah your God is he that goeth with you, to fight for you against your enemies, to save you.

Deuteronomy 31:6

Be strong and courageous, fear them not, neither be afraid of them; for Jehovah thy God, he it is that goeth with thee; he will not leave thee, nor forsake thee.

Deuteronomy 31:8

And Jehovah, he it is that goeth before thee: he will be with thee; he will not leave thee, nor forsake thee; fear not, neither be dismayed.

Joshua 11:6

And Jehovah said to Joshua, Be not afraid because of them; for to-morrow about this time will I give them all up slain before Israel: their horses shalt thou hough, and thou shalt burn their chariots with fire.

Nehemiah 4:14

And I looked, and rose up, and said to the nobles, and to the rulers, and to the rest of the people, Be not afraid of them: remember the Lord who is great and terrible, and fight for your brethren, your sons and your daughters, your wives and your houses.

Psalm 17:1-2

{A Prayer of David.} Hear the right, O Jehovah, attend unto my cry; give ear unto my prayer, which is not out of feigned lips.

Isaiah 41:10-16

Fear not, for I am with thee; be not dismayed, for I am thy God: I will strengthen thee, yea, I will help thee, yea, I will uphold thee with the right hand of my righteousness.

Isaiah 43:1-2

But now thus saith Jehovah, that created thee, O Jacob, and he that formed thee, O Israel: Fear not, for I have redeemed thee, I have called thee by thy name; thou art mine.

Treasury of Scripture Knowledge

Summary

And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat, Thus saith the LORD unto you, Be not afraid nor dismayed by reason of this great multitude; for the battle is not yours, but God's.

Bible References

The battle

2 Chronicles 32:8
with him is an arm of flesh, but with us is Jehovah our God to help us and to fight our battles. And the people depended upon the words of Hezekiah king of Judah.
1 Samuel 17:47
and all this congregation shall know that Jehovah saves not with sword and spear; for the battle is Jehovah's, and he will give you into our hands.