Any Jew can recite the blessing, provided they are old enough to understand the significance of the mitzvah. After the blessing, the mezuzah is attached. Whenever passing through the doorway, many people touch a finger to the mezuzah as a way of showing respect to God.

Why do Jews mark their doors?

As the story goes, during the tenth and final plague, God passes through the land of Egypt and strikes down the firstborn of every household. But the Jews have been told to mark their doors with the blood of a lamb theyve sacrificed — the Passover offering — and so God “passes over” their homes.