Deuteronomy 20:2-4

2When you are about to go into battle, the priest shall come forward and address the army. 3He shall say: “Hear, Israel: Today you are going into battle against your enemies. Do not be fainthearted or afraid; do not panic or be terrified by them.

4For the LORD your God is the one who goes with you to fight for you against your enemies to give you victory.”