Deuteronomy 20:2-4

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

3And shall say unto them, Hear, O Israel, ye approach this day unto battle against your enemies: let not your hearts faint, fear not, and do not tremble, neither be ye terrified because of them;12

4For the Lord your God is he that goeth with you, to fight for you against your enemies, to save you.