A mezuzah (Hebrew: "doorpost") (plural: mezuzot is a piece of parchment (often contained in a decorative case) inscribed with specified Hebrew verses from the Torah. These verses comprise the Jewish prayer "Shema Yisrael", beginning with the phrase: "Listen, Israel, the Lord is our God, the Lord is One."
A mezuzah is affixed to the doorframe of Jewish homes to fulfill the mitzvah (Biblical commandment) to inscribe the words of the Shema "on the doorposts of your house"