Yechezkel 3:7-9

Orthodox Jewish Bible

⁷ But Bais Yisroel will not pay heed unto thee; for they will not pay heed unto Me; for kol Bais Yisroel are khizkei metzach (hard-set of brow) and keshei-lev (hard-hearted).

⁸ Hinei, I have made thy face chazakim against their faces, and thy metzach chazak (forehead strong) against their metzach.

⁹ As a shamir (adamant, hardest stone) more chazak than flint have I made thy metzach (forehead); fear them not, neither be terrified at their looks, though they be a bais meri (house of rebellion).