Ezekiel 3:7-9

7yet the house of Israel will not be willing to listen to you and obey you, since they are not willing to listen to Me and obey Me, for the entire house of Israel is stubborn and obstinate.

8Behold, I have made your face as hard as their faces and your forehead as hard as their foreheads.

9I 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.”