en_tn/pro/27/21.md

crucible

a container used for heating substances to very high temperatures

Even if you crush a fool ... yet his foolishness will not leave him

This means that even if a fool is made to suffer hardship or pain (being crushed is often a metaphor for suffering in Hebrew), he will remain foolish. (See: rc://en/ta/man/translate/figs-metaphor)

pestle

a tool for grinding materials in a mortar