A mezuzah (Hebrew: מְזוּזָה "doorpost"; plural: מְזוּזוֹת mezuzot) is a piece of parchment called a klaf contained in a decorative case and inscribed with specific Hebrew verses from the Torah (Deuteronomy 6:4–9 and 11:13–21).

Typically, a mezuzah is affixed to the doorpost of Jewish homes to fulfill the mitzvah (Biblical commandment) to "write the words of God on the gates and doorposts of your house" (Deuteronomy 6:9).