Harder
3 verses in 3 books of the King James Bible.
By Book
Every Occurrence
Proverbs 18:19A brother offended is harder to be won than a strong city: and their contentions are like the bars of a castle.
Jeremiah 5:3O LORD, are not thine eyes upon the truth? thou hast stricken them, but they have not grieved; thou hast consumed them, but they have refused to receive correction: they have made their faces harder than a rock; they have refused to return.
Ezekiel 3:9As 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.