Deuteronomy 20:1

2 Chronicles 32:7-8 NIV
“Be strong and courageous. Do not be afraid or discouraged because of the king of Assyria and the vast army with him, for there is a greater power with us than with him. With him is only the arm of flesh, but with us is the Lord our God to help us and to fight our battles.” And the people gained confidence from what Hezekiah the king of Judah said.

Deuteronomy 31:8 NIV
The Lord himself goes before you and will be with you; he will never leave you nor forsake you. Do not be afraid; do not be discouraged.”