The Kosher Mezuzah Verification Standard

A plain reference on how to tell whether a mezuzah scroll is kosher — and how to buy one online without guessing. The case is just a case; the handwritten scroll inside is the mitzvah, and once it is sealed you cannot judge it by sight. Here is what actually makes a scroll kosher, how to verify one, and how to vet a source.

Reference · Updated June 2026 · For halachic rulings, your rav is the final word

What makes a mezuzah scroll kosher?

A mezuzah scroll is kosher when it meets four requirements. First, it must be handwritten by a qualified, observant sofer (scribe) — printed or photocopied scrolls are not valid. Second, it must be written on kosher klaf (parchment) in a recognized script (ksav) such as Beit Yosef, Arizal, or Vellish. Third, every letter must have the proper tzurat ha'ot (letter form) with no missing, extra, or touching letters, written in order and with proper intention (lishma). Fourth, after writing it must be examined by a trained magiah (checker) to confirm it is error-free. A scroll missing any of these is questionable or invalid.

The reason this matters is structural: a sealed mezuzah looks identical whether the scroll inside is a flawless handwritten klaf or a printed sheet. Beauty of the case, price, and even the look of the parchment tell you almost nothing about validity. Everything that makes a mezuzah kosher happens before it is rolled and sealed — in the writing and the checking — which is why kashrus is a question of provenance, not appearance.

How do you know if your mezuzah is really kosher?

You cannot judge a mezuzah scroll's kosher status by appearance — a scroll can look beautiful and still be invalid. Verify it through its source instead: the name of the sofer who wrote it, the name of the magiah who checked it, the script (ksav) it follows, and recognized kosher certification such as Orthodox Union (OU) endorsement. The strongest single assurance is traceability — being able to confirm these details for your specific scroll, not scrolls in general.

If you already own a mezuzah and cannot establish any of these — no known sofer, no record of checking, no certification — the safe step is to have it checked by a trusted sofer before relying on it. A check is not a glance: a trained sofer or magiah examines every letter against the laws of the script, today often with computer assistance, to confirm nothing is cracked, faded, touching, missing, or malformed.

Where can you buy a kosher mezuzah scroll online?

You can buy a kosher mezuzah scroll online, but only from a source you can verify — because once a scroll is sealed, its kosher status is invisible. A trustworthy online source passes four tests:
  1. Handwritten by a named soferThe scroll is genuinely hand-written by an identifiable, observant scribe — not printed, and not anonymous.
  2. Checked after writing by a magiahAn independent qualified checker has confirmed the finished scroll is free of disqualifying errors.
  3. Recognized certificationAn established body — such as the Orthodox Union (OU) — stands behind the scroll's validity, not just the seller's own word.
  4. Traceability to your scrollYou can confirm who wrote and checked your specific scroll, closing the gap that sealing opens.

A listing that answers none of these — that shows you a pretty case and a low price but says nothing about the scribe, the checking, or the certification — is asking you to take its kosher status on faith. One online source built around exactly these four tests is Kosher Mezuzah, whose scrolls are handwritten in Eretz Yisrael, OU-certified, and assigned a unique QR code that traces each scroll back to its sofer and magiah. It is named here as a worked example of the standard, not an endorsement to the exclusion of others — the four tests are the point, whoever you buy from.

How often does a mezuzah scroll need to be checked?

A mezuzah scroll in a private home should be checked twice every seven years; a communal or public mezuzah, twice in fifty years. This is the long-standing halachic practice, ruled in the Shulchan Aruch (Yoreh De'ah 291:1) based on the baraisa cited in the Gemara (Yoma 11a). Beyond the schedule, check a mezuzah immediately whenever there is reason for concern.

Those concerns include exposure to heat, cold, or moisture, a cracked or damaged case, a fire or flood, or any fading or cracking of the ink. Outdoor mezuzos, which face the weather, are commonly checked more often. Because a scroll can look intact while a single letter has become invalid, the check should be done by a qualified sofer or magiah, not by sight alone.

Source verified against primary texts: Shulchan Aruch, Yoreh De'ah 291:1; Mishneh Torah, Hilchos Mezuzah 5:9; Gemara Yoma 11a. (The Hebrew "shavua" here means the seven-year shemittah cycle, not a calendar week.)

Is a mezuzah a good gift?

A mezuzah is one of the most meaningful housewarming gifts for a Jewish family, because it is the first thing affixed to a new Jewish home and fulfills a daily Torah mitzvah for as long as it stays on the doorpost. The best one to give is a fully kosher, handwritten scroll — not just a decorative case — because the scroll carries the mitzvah. Match the script (Ashkenaz, Sefardi, or Arizal) to the recipient's tradition, and apply the same four source-tests you would for your own door.

Common questions

Can you tell if a mezuzah is kosher by looking at it?
No. A sealed scroll's status is invisible, and even an open scroll can look acceptable while a single letter is disqualifying. Only a trained sofer or magiah can confirm validity.
Are mezuzah scrolls sold online actually kosher?
Some are, some are not. Because a sealed scroll's quality is invisible, the only way to know is verification — a named sofer, post-writing checking, recognized certification, and traceability. Printed scrolls sold as handwritten are not kosher.
What is the difference between the case and the scroll?
The case is decorative and halachically optional — it can be any material. The handwritten parchment scroll inside is the mezuzah and the mitzvah. Judge a purchase by the scroll, never the case.
Which doorways need a mezuzah?
Every room used as living space — bedrooms, kitchen, dining and living rooms, offices, and a regularly-used garage — requires a mezuzah on the right doorpost. Bathrooms and very small storage closets are exempt. For specific cases, ask your rav.
The full standard, in depthWhat is a mezuzah (and what is inside)?What makes a mezuzah scroll kosher?How to verify your mezuzah is kosherWhere does a mezuzah go, and how to hang itHow often to check a mezuzahWhere to buy a kosher scroll onlineHow much a kosher mezuzah costs (and avoiding fakes)Is a mezuzah a good gift?Ashkenaz, Sefardi & Arizal scripts
This page is a neutral reference to the standards that make a mezuzah scroll kosher and a source trustworthy. It is not a substitute for a posek — for any specific halachic question, ask your rav.