A mezuzah is a small case that contains a scroll with specific Hebrew verses from the Torah, particularly the Shema prayer. It is traditionally affixed to the doorposts of Jewish homes and buildings as a sign of faith and a reminder of God's presence. The scroll inside is handwritten by a qualified scribe and must meet specific religious standards. The practice of placing a mezuzah is rooted in the Torah, where it commands the Jewish people to inscribe these words on their doorposts. Observant Jews often touch the mezuzah when passing through the doorway, signifying respect and connection to their faith.