Leviticus 26:18-21

18If in spite of all this you still will not listen to Me and be obedient, then I will punish you seven times more for your sins.

19I will break your pride in your power, and I will make your sky like iron [giving no rain and blocking all prayers] and your ground like bronze [hard to plow and yielding no produce].

20Your strength will be spent uselessly, for your land will not yield its produce and the trees of the land will not yield their fruit.

21‘If then, you act with hostility toward Me and are unwilling to obey Me, I will increase the plague on you seven times in accordance with your sins.