'Hardened' in the Bible

“Thus says the Lord of hosts, ‘Let your hands be strong, you who in these days hear these words from the mouths of the prophets who, on the day that the foundation of the house of the Lord of hosts was laid, foretold that the temple might be rebuilt.

And as you have been a curse among the nations, O house of Judah (Southern Kingdom) and house of Israel (Northern Kingdom), so I will save you, that you may be a blessing. Fear not; let your hands be strong.’