Ezekiel 3:7-9

But the house of Israel will not be willing to listen to you, for they are not willing to listen to me: because all the house of Israel have a hard forehead and a stubborn heart. Behold, I have made your face as hard as their faces, and your forehead as hard as their foreheads. Like emery harder than flint have I made your forehead. Fear them not, nor be dismayed at their looks, for they are a rebellious house.”