the sky bronze, the earth iron

The LORD will make the pestilence cling to you until it has consumed you off the land that you are entering to possess. The LORD will afflict you with consumption, fever, inflammation, with fiery heat and drought, and with blight and mildew; they shall pursue you until you perish. The sky over your head shall be bronze, and the earth under you iron. The LORD will change the rain of your land into powder, and only dust shall come down upon you from the sky until you are destroyed. The LORD will cause you to be defeated before your enemies; you shall go out against them one way and flee before them seven ways. You shall become an object of horror to all the kingdoms of the earth. Your corpses shall be food for every bird of the air and animal of the earth, and there shall be no one to frighten them away. The LORD will afflict you with the boils of Egypt, with ulcers, scurvy, and itch, of which you cannot be healed. The LORD will afflict you with madness, blindness, and confusion of mind; you shall grope about at noon as blind people grope in darkness, but you shall be unable to find your way; and you shall be continually abused and robbed, without anyone to help.
Deuteronomy 28:15-29