Leviticus 26:18-21

18And if ye will not yet for all this hearken to me, then I will punish you seven times more for your sins. 19And I will break the pride of your power; and I will make your heaven as iron, and your earth as brass: 20And your strength shall be spent in vain: for your land shall not yield her increase, neither shall the trees of the land yield their fruits. 21And if ye shall walk contrary to me, and will not hearken to me; I will bring seven times more plagues upon you according to your sins.1