Targum Jonathan on Deuteronomy
Four keys are in the hand of the Lord of all the world, which He hath not delivered into the hands of any secondary power: the key of life, and of the tombs, and of food, and of rain; and thus did Mosheh the prophet speak: The Lord will open to you His good treasure which is with Him in the heavens, and will give you the rain of your land in its season; the early in Marchesvan, and the latter in Nisan; and will bless you in all the works of your hands; and you will lend to many peoples, but shall have no need to borrow.