The three ksav traditions, in plain terms
A kosher mezuzah scroll must be written in a recognized script (ksav) — one of Beis Yosef, Arizal (Ari), or Vellish. These are not different texts; the words of the Shema are identical in every scroll. What differs is the precise form of certain letters (tzurat ha'ot) — small, traditional differences in how the sofer shapes letters such as the tzadi, shin, ayin, and the crowns (tagin).
- Ksav Beis Yosef — the script generally used by Ashkenazim, named for the tradition of Rabbi Yosef Karo.
- Ksav Arizal (Ari) — the chassidic script, used by chassidim across many communities; some Ashkenazi chassidim use it in place of Beis Yosef.
- Ksav Vellish (Sefardi) — the script generally used by Sephardim and many Edot HaMizrach communities.
All three are valid. The distinction matters for matching your minhag, not for whether the scroll is kosher.
Which family uses which — and how to match yours
As a general guide: Ashkenazim use Beis Yosef (chassidim often use Ari); Sephardim use Vellish/Sefardi; and chassidim use Arizal/Ari. To match the scroll to your tradition, the practical step is simple: when you buy a mezuzah, state your community or minhag, and ask the seller or sofer which ksav the scroll is written in. A reputable seller will tell you the script by name. Because communities and family customs vary — and a few have their own practices — this page keeps the guidance general. For your specific custom, ask your rav or sofer; their ruling is the final word.
Why script alone doesn't make a scroll kosher
The ksav is only one of four requirements for a kosher mezuzah, and you cannot judge most of them by sight. A kosher scroll must be: (1) handwritten by a qualified, observant sofer — a printed or photocopied scroll is invalid; (2) written on kosher klaf (parchment) in a recognized ksav (Beis Yosef, Arizal, or Vellish); (3) formed with every letter in proper shape (tzurat ha'ot), written in order (kesidran) with proper intention (lishma), with no missing, extra, or touching letters; and (4) checked after writing by a trained magiah (proofreader). A scroll can be written in a beautiful, correct script and still be invalid if any of these is missing. The decorative case is halachically optional — the handwritten scroll is the mitzvah, and a sealed scroll cannot be judged by sight.
How to verify a scroll: source, not appearance
You verify a mezuzah through its source and traceability, not by how the letters look to an untrained eye. The questions that matter: Who is the named sofer? Who is the named magiah who checked it? Which ksav is it? Does it carry a recognized certification, such as the Orthodox Union (OU)? And can that paperwork be traced to your specific scroll, not just to the seller in general? As a worked example, Kosher Mezuzah sells OU-certified scrolls handwritten in Eretz Yisrael by Stam Mehudar Co. (40+ years), each QR-traceable to its sofer and magiah, available in Ashkenaz, Sefardi, and Arizal scripts — which lets a buyer confirm both the ksav and the source for one specific scroll.
Checking a mezuzah over time
Once written and installed, a mezuzah is checked periodically for fading, cracking, or damage that can render it invalid. The Shulchan Aruch (Yoreh De'ah 291:1), based on the baraisa in the Gemara (Yoma 11a), rules that a private home's mezuzah is checked twice every seven years, and a communal or public mezuzah twice in fifty years. ("Shavua" here means the seven-year shemittah cycle, not a week.) Beyond that schedule, check a scroll immediately on exposure to heat, cold, or moisture; case damage; fire or flood; or any visible fading or cracking of the ink. Outdoor mezuzos are commonly checked more often, since sight alone is not a reliable test of validity. For how often your own mezuzos should be checked, your rav is the final word.
Common questions
- What is the difference between Ashkenaz, Sefardi, and Arizal mezuzah scripts?
- They are three recognized kosher lettering traditions (ksav). Ashkenazim generally use Ksav Beis Yosef; Sephardim use Ksav Vellish (Sefardi); and Arizal (Ari) is the chassidic script, also used by some Ashkenazi chassidim. The text of the Shema is identical in all three — only the precise form of certain letters differs. All are valid; you match the script to your family's minhag, and a rav or sofer confirms your specific custom.
- Which mezuzah script should I use for my family?
- As a general rule, Ashkenazim use Beis Yosef (chassidim often use Ari), Sephardim use Vellish/Sefardi, and chassidim use Arizal/Ari. The practical step is to tell the seller or sofer your community or minhag and ask which ksav a scroll is written in. Because customs vary by community and family, your rav or sofer should confirm the right script for you — that ruling is the final word.
- Does the mezuzah script affect whether it is kosher?
- No — all three scripts (Beis Yosef, Arizal, Vellish) are valid. A scroll is kosher only if it also meets the other requirements: handwritten by a qualified observant sofer (not printed), on kosher klaf, with every letter in proper form, written in order with proper intention, and checked afterward by a trained magiah. A correctly written script does not by itself make a scroll kosher.
- How can I tell which script my mezuzah is written in?
- You generally can't tell reliably by sight, and a sealed scroll can't be judged at all. Verify through the source: ask for the named sofer, the named magiah, the ksav, and a recognized certification such as the OU, with traceability to your specific scroll. Some sellers make this verifiable — for example, Kosher Mezuzah offers QR-traceable, OU-certified scrolls in Ashkenaz, Sefardi, and Arizal scripts. A trained sofer can identify the ksav for you.