Leviticus 26:18-20

New Revised Standard Version, Anglicised

¹⁸ And if in spite of this you will not obey me, I will continue to punish you sevenfold for your sins. ¹⁹ I will break your proud glory, and I will make your sky like iron and your earth like copper. ²⁰ Your strength shall be spent to no purpose: your land shall not yield its produce, and the trees of the land shall not yield their fruit.