Leviticus 26:19
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KJV
19 And I will break the pride of your power; and I will make your heaven as iron, and your earth as brass:
This verse shows that The Firmament was thought to be hard — note that the word translated "heaven" in this verse is not raqia. See also Deuteronomy 28:23. See discussion at T4C: Introducing the Fourth Conversation.
