Deuteronomy 20:1-3

1When thou goest forth to battle against thine enemies, and seest horses, and chariots, and a people more than thou, thou shalt not be afraid of them: for the LORD thy God is with thee, which brought thee up out of the land of Egypt.

2And it shall be, when ye draw nigh unto the battle, that the priest shall approach and speak unto the people,

3and shall say unto them, Hear, O Israel, ye draw nigh this day unto battle against your enemies: let not your heart faint; fear not, nor tremble, neither be ye affrighted at them;