2 Chronicles 20:15

And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat. Thus says LORD to you, Fear ye not, neither be dismayed because of this great multitude. For the battle is not yours, but God's.

1 Samuel 17:47

and that all this assembly may know that LORD saves not with sword and spear. For the battle is LORD's, and he will give you into our hand.

2 Chronicles 32:7-8

Be strong and of good courage, be not afraid nor dismayed of the king of Assyria, nor of all the multitude that is with him. For there is a greater with us than with him.

Exodus 14:13-14

And Moses said to the people, Fear ye not. Stand still, and see the salvation of LORD, which he will work for you today, for the Egyptians whom ye have seen today, ye shall see them again no more forever.

Deuteronomy 1:29-30

Then I said to you, Dread not, neither be afraid of them.

Deuteronomy 20:1

When thou go forth to battle against thine enemies, and see horses, and chariots, [and] a people more than thou, thou shall not be afraid of them, for LORD thy God is with thee, who brought thee up out of the land of Egypt.

Deuteronomy 20:4

For LORD your God is he who goes with you, to fight for you against your enemies, to save you.

Deuteronomy 31:6

Be strong and of good courage, fear not, nor be frightened at them, for LORD thy God, he it is who goes with thee. He will not leave thee, nor forsake thee.

Deuteronomy 31:8

And LORD, he it is who goes before thee. He will be with thee. He will not fail thee, nor forsake thee. Fear not, neither be dismayed.

Joshua 11:6

And LORD said to Joshua, Be not afraid because of them, for tomorrow at this time I will deliver them up all slain before Israel. Thou shall hock their horses, and burn their chariots with fire.

Nehemiah 4:14

And I looked, and rose up, and said to the ranking men, and to the rulers, and to the rest of the people, Be not ye afraid of them. Remember LORD, who is great and awesome, and fight for your brothers, your sons, and your daughters

Psalm 17:1-2

Hear the right, O LORD, attend to my cry. Give ear to my prayer, that goes not out of feigned lips.

Isaiah 41:10-16

Fear thou 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 says LORD who created thee, O Jacob, and he who formed thee, O Israel: Fear not, for I have redeemed thee. I have called thee by thy name, Thou are 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 LORD our God to help us, and to fight our battles. And the people rested themselves upon the words of Hezekiah king of Judah.
1 Samuel 17:47
and that all this assembly may know that LORD saves not with sword and spear. For the battle is LORD's, and he will give you into our hand.