Deuteronomy 20:3 KJV
And 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;
Deuteronomy 20:3, King James Version
In context
2 And it shall be, when ye are come nigh unto the battle, that the priest shall approach and speak unto the people,
3 And 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;
4 For the Lord your God is he that goeth with you, to fight for you against your enemies, to save you.