Ezekiel 3:9

And it shall be continually stronger than a rock: be not afraid of them, neither be dismayed at their faces, because it is a provoking house.

As an adamant harder than flint have I made thy forehead: fear them not, neither be dismayed at their looks, though they be a rebellious house.

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.”