Deuteronomy 20:2-4

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

3and shall say unto them, Hear, Israel, ye are approaching this day unto battle against your enemies: let not your hearts faint, fear not, and do not tremble, neither be afraid of them;

4for Jehovah your 1God is he that goeth with you, to fight for you against your enemies, to save you.