A mezuzah (Hebrew: מְזוּזָה "doorpost"; plural: מְזוּזוֹת mezuzot) is a piece of parchment inscribed with specific Hebrew verses from the Torah, which Jews affix in a small case to the doorposts of their homes. These verses are the Biblical passages in which the use of a mezuzah is commanded (Deuteronomy 6:4–9 and 11:13–21); they also form part of the Shema prayer.
According to traditional Jewish law, a mezuzah must be placed on every post-and-lintel entrance to a residence, courtyard, or city. Since the time of Meir of Rothenburg (c. 1215–1293), religious Jews have increasingly also placed mezuzot on the entrances to non-residential buildings such as synagogues and offices, and on each internal doorway of the home or building, with the exception of bathrooms (where the name of God is forbidden) and small closets.
