ה֣וֹן עָ֭שִׁיר קִרְיַ֣ת עֻזּ֑וֹ וּכְחוֹמָ֥ה נִ֝שְׂגָּבָ֗ה בְּמַשְׂכִּיתֽוֹ׃
부자의 재물은 그의 견고한 성이라 그가 높은 성벽 같이 여기느니라
Rashi
and like a strong wall his wealth is to him in his chambers. Since the house is paved with a floor of stones that cover the earth, it is called אבן משכית, a covering stone.