אוֹצָ֤ר ׀ נֶחְמָ֣ד וָ֭שֶׁמֶן בִּנְוֵ֣ה חָכָ֑ם וּכְסִ֖יל אָדָ֣ם יְבַלְּעֶֽנּוּ׃
There is desirable treasure and oil in the dwelling of the wise; But a foolish man swalloweth it up.
Rashi on Proverbs
but man’s foolishness Heb. וכסיל אדם foolishness of a man.