'Do Not Be Afraid' in the Bible

and he said, "Listen, all Judah, and you inhabitants of Jerusalem, and you king Jehoshaphat. Thus says the LORD to you, 'Do not be afraid, neither be dismayed by reason of this great multitude; for the battle is not yours, but God's.

You will not need to fight this battle. Set yourselves, stand still, and see the salvation of the LORD with you, O Judah and Jerusalem. Do not be afraid, nor be dismayed. Go out against them tomorrow, for the LORD is with you.'"

"Be strong and courageous, do not be afraid nor dismayed for the king of Assyria, nor for all the multitude who is with him; for there is a greater with us than with him.