Ezekiel 3:9, 26-27

I have made your forehead like emery (diamond), harder than flint. Do not be afraid of them or be dismayed before them, though they are a rebellious house.” [Is 50:7; Jer 1:18; 15:20; Mic 3:8]

And I will make your tongue stick to the roof of your mouth so that you cannot talk and you cannot be a man who rebukes the people, for they are a rebellious house. But when I speak with you, I will open your mouth and you will say to them, ‘Thus says the Lord GOD.’ He who hears, let him hear; and he who refuses [to hear], let him refuse; for they are a rebellious house.