Deuteronomy 20:2-4

20:2 As you move forward for battle, the priest will approach and say to the soldiers, 20:3 “Listen, Israel! Today you are moving forward to do battle with your enemies. Do not be fainthearted. Do not fear and tremble or be terrified because of them, 20:4 for the Lord your God goes with you to fight on your behalf against your enemies to give you victory.”