Leviticus 26:18-21

18“ ‘If after all this you will not listen to me, I will punish you for your sins seven times over. 19I will break down your stubborn pride and make the sky above you like iron and the ground beneath you like bronze. 20Your strength will be spent in vain, because your soil will not yield its crops, nor will the trees of your land yield their fruit. 21“ ‘If you remain hostile toward me and refuse to listen to me, I will multiply your afflictions seven times over, as your sins deserve.