OT-PROPHET.filter - nkjv harder:

nkjv@Jeremiah:5:3 @ O LORD, are not Your eyes on the truth? You have stricken them, But they have not grieved; You have consumed them, But they have refused to receive correction. They have made their faces harder than rock; They have refused to return.

nkjv@Ezekiel:3:9 @ Like adamant stone, harder than flint, I have made your forehead; do not be afraid of them, nor be dismayed at their looks, though they are a rebellious house."