'Keys' in the Bible

and I will give to thee the keys of the reign of the heavens, and whatever thou mayest bind upon the earth shall be having been bound in the heavens, and whatever thou mayest loose upon the earth shall be having been loosed in the heavens.'

and he who is living, and I did become dead, and, lo, I am living to the ages of the ages. Amen! and I have the keys of the hades and of the death.