Ezekiel 3:7

He said to me, “Son of man, go to the house of Israel, and speak my words to them.

For you are not sent to a people of a strange speech and of a hard language, but to the house of Israel—

not to many peoples of a strange speech and of a hard language, whose words you can’t understand. Surely, if I sent you to them, they would listen to you.

Behold, I have made your face hard against their faces, and your forehead hard against their foreheads.

I have made your forehead as a diamond, harder than flint. Don’t be afraid of them, neither be dismayed at their looks, though they are a rebellious house.”

Moreover he said to me, “Son of man, receive in your heart and hear with your ears all my words that I speak to you.