Deuteronomy 20:1

When thou goest out to battle against thine enemies, and seest horses and chariots, an equipment which Israel did not possess at that time, and which always made the impression of superior power on the part of the enemy, and a people more than thou, be not afraid of them, for the battle would not be to the stronger and more numerous by human calculation; for the Lord, thy God, is with thee, as He showed so often in later times, which brought thee up out of the land of Egypt, thereby showing the extent of His power.