Exodus 4:25 - Then Zipporah took a sharp stone, H6864 and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me.
Ezekiel 3:9 - As an adamant harder than flint H6864 have I made thy forehead: fear them not, neither be dismayed at their looks, though they be a rebellious house.