Ezekiel 3:7-9

7But the people of Israel are not willing to listen to you because they are not willing to listen to me, for all the Israelites are hardened and obstinate. 8But I will make you as unyielding and hardened as they are.

9I will make your forehead like the hardest stone, harder than flint. Do not be afraid of them or terrified by them, though they are a rebellious people.”