Does a Mezuzah Scroll Need to Be Kosher?

Although a “non-kosher” case does not usually invalidate the affixing of the mezuzah, sometimes it can. Even if an improper mezuzah case is still halachically permissible, one should not suffice with the bare minimum; rather, one should be scrupulous in this mitzvah and merit to lengthen the days of one's life.

What makes the mezuzah scroll kosher?

For a mezuzah text to be kosher, no two letters can touch, no letter can have a break in it, every letter must be clearly distinguishable, no misspellings or omissions are allowed, and the scribe must say a prayer to sanctify the name of God every time he writes it on the page (by custom, sofers are all men).

What do Jews do when they pass the mezuzah?

It is customary for religious Jews to touch the mezuzah every time they pass through a door and kiss the fingers that touched it. However, kissing the mezuzah has also become customary for many secular Jews who think of the mezuzah as a good luck charm.