Deuteronomy 20:1-3

1When you go out to war against your enemies and see horses, chariots, and an army larger than yours, do not be afraid of them; for the LORD your God, who brought you out of the land of Egypt, is with you.

2When you are about to go into battle, the priest is to come forward and address the army,

3saying to them, “Hear, O Israel, today you are going into battle with your enemies. Do not be fainthearted or afraid; do not be alarmed or terrified because of them.