'Forehead' in the Bible

But the house of Israel will not hearken unto thee, for none of them will hearken unto me. For all the house of Israel are hard of forehead and stiff of heart.

Behold, I have made thy face strong against their faces, and thy forehead strong against their foreheads.

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.

And I put a jewel on thy forehead, and earrings in thine ears, and a beautiful crown upon thine head.