Leviticus 26:19

ושברתי את גאון עזכם AND I WILL BREAK THE EXCELLENCY OF YOUR STRENGTH — This is a reference to the Temple; for thus does it state, (Ezekiel 24:21) “Behold I will profane my sanctuary, the excellency of your strength”. ונתתי את שמיכם כברזל ואת ארצכם כנחשה AND I WILL MAKE YOUR HEAVEN AS IRON AND YOUR EARTH AS COPPER — This threat is even severer than that of Moses, because there it says, (Deuteronomy 28:23) “And thy heaven that is over thy head shall be copper, [and the earth that is under thee shall be iron]” which implies that the heaven will at least exude moisture (will give some humidity) just as the copper exudes moisture, whilst the earth will not exude just as iron does not exude, and so it will keep its fruit in good condition, since it will not be too humid. Here, however, Scripture threatens that the heaven will not exude moisture, just as iron does not exude, and there will therefore be draught in the world, whilst the earth will exude (be too humid) just as copper sweats, and it will consequently make its fruits perish (Sifra, Bechukotai, Chapter 5 3).

And I will break the pride of your power; and I will make your skies like iron, and your earth like brass:

וְשָׁבַרְתִּ֖י אֶת־גְּא֣וֹן עֻזְּכֶ֑ם וְנָתַתִּ֤י אֶת־שְׁמֵיכֶם֙ כַּבַּרְזֶ֔ל וְאֶֽת־אַרְצְכֶ֖ם כַּנְּחֻשָֽׁה׃