Deuteronomy 20:1-3

1“When you go out to battle against your enemies and see horses and chariots and people more numerous than you, do not be afraid of them; for the Lord your God, who brought you up from the land of Egypt, is with you.

2When you approach the battle, the priest shall come forward and speak to the people,

3and shall say to them, ‘Hear, O Israel: you are advancing today to battle against your enemies. Do not lack courage. Do not be afraid, or panic, or tremble [in terror] before them,