Be sure your STa”M is kosher
The STa”M Project (STAMP) is adding transparency, traceability and trust into today’s world of Sifrei Torah, Tefillin, and Mezuzos.
Rabbi Boruch Hirschfeld shlit"a
Rav of Cong. Ahavas Yisrael, Rosh Kollel Ateres Chaim Boruch Cleveland, OH
“STAMP has brought professionalism and organized accountability to the field of STa”M, providing Klal Yisrael with certified kashrus on these items. They have brought tremendous hisorerus to others in the field as many others are following their lead…I have already had the chance to use their resources in Cleveland and for my own family.”
Rabbi Yaakov Hopfer shlit"a
Rav of Shearith Israel Congregation & President, Vaad HaRabonim, Baltimore, MD
“Until today, when we would go into a seforim store to buy a mezuzah, we couldn’t know where it came from. We wanted to do this mitzvah properly but didn’t have the ability to ensure its kashrus. Today, we should all have enormous hakaras hatov to STAMP for the work they are doing, enhancing the quality of STa”M, restoring these mitzvos to their proper state and seeing to it that klal yisrael is able to be mikayeim these mitzvos properly.”
Rabbi Moshe Elefant shlit”a
COO, OU Kosher
Rabbi Moshe Hauer shlit”a
Executive Vice President, Orthodox Union
“Through its deliberate and thoughtful work, STAMP has begun to create a positive transformation in the STa”M marketplace. We are pleased that through the efforts of our Kashrus personnel, we are able to participate in STAMP’s efforts of education and oversight, elevating the standards of Kashrus and transparency and enhancing consumer confidence.”
Rabbi Shmuel Fuerst
Rav, Agudas Yisrael, Peterson Park, Chicago; Dayan, Agudath Israel of Illinois
Coming Soon
Rabbi Yisrael Reisman, shlit”a
Rav, Agudas Yisroel of Madison; Rosh Yeshiva, Torah Vodaas
Coming Soon
Featured in:
In partnership with the Orthodox Union
The OU, the world’s largest kosher certifying agency, is a partner and promoter of STAMP’s work. The OU symbol accompanies all STAMP-certified mezuzos and tefillin to signify the OU’s approval of the supervision process.
In partnership with Hisachdus HaRabbonim
The CRC (Central Rabbinical Congress), the largest and most trusted kosher certifying agency in the heimishe market, partners with STAMP to support and promote reliable production of STa”M. The CRC logo appears on select STAMP-certified STa”M items to indicate their approval of those specific products.
THE NEED
Do you know that your mezuzos are kosher or do you just assume?
For decades, STa”M has been produced without unified supervision. Most consumers have no way of knowing who wrote their mezuzah, which materials were used, or whether it was properly checked.
Even the top sofrim and checkers (magihim) can make mistakes. Without oversight, errors are more likely to go undetected, increasing the likelihood of your STa”M being problematic.
What kosher agencies did for food 100 years ago, STAMP is now doing for STa”M. And it’s long overdue.
Before STAMP
Buyers can purchase the most mehudar looking item written by the world’s greatest sofer and never know that it was written on/with material that was not manufactured in a halachically reliable manner.
With STAMP
Before receiving full STAMP-certification, every sofer must sign a contract, included in which is the requirements to use only materials approved by the STAMP Rabbinic board.
Before STAMP
Many sofrim were not certified at all, and a large percentage of those who were did not renew their certification as required.
With STAMP
For certification, a sofer passes a multi-stage test (written, oral, and hands-on), provides references, and renews yearly. Only by fulfilling these requirements can the sofer maintain access to having his items certified by STAMP.
Before STAMP
Magihim worked independently, each by their own standard and with no organized oversight.
With STAMP
STAMP-certified magihim employed by STAMP work together in the same checking branch and abide by standards set by STAMP’s rabbinic board. STAMP places strong emphasis on the professional development of its magihim by giving feedback from multiple sources and ensuring that their compensation and working conditions are unparalelled.
Before STAMP
When a mezuzah was purchased, no information on its origin was available to the buyer, and sellers could not take full responsibility for an item’s kashrus.
With STAMP
Every STAMP mezuzah is assigned its own ID card, displaying its full history and biography as well as a unique QR code that is linked to STAMP’s database, verifying the item’s authenticity and ensuring every traceable detail is available to the eventual owner. The two are then sealed in a tamper-proof plastic sleeve, giving the buyer total assurance that the item has been untouched since leaving STAMP.
Ensuring kashrus requires regulation
The Certification process
Every mezuzah goes through a five-stage checking process.
Our state-of-the-art computer program starts the review process by checking for added/missing letters and other major errors that can invalidate the mezuzah.
A first magiah thoroughly checks for potential errors.
Our computer program performs a second review.
A second, more experienced, magiah thoroughly checks for any errors that the first magiah or computer may have missed.
A final computer check verifies that the mezuzah is completely error-free and ready to be STAMP-certified.
After the mezuzah passes the full review process and becomes STAMP-certified, it is assigned a certificate of authenticity. The two are then sealed together in a tamper-proof plastic sleeve.
Your Mezuzah’s Barcode
Do you already own a STAMP certified mezuzah?
Scan the QR code or manually enter the numeric ID number under it to learn about your STAMP-certified item.
- Who wrote it
- Who checked it
- What materials were used
- Which halachic standards are met
Educational resources
Protect your mitzvos through education
The STa”M Project offers accessible and engaging Torah learning on STa”M topics for every level.
For Everyone
Audio Shiurim
Stream or download shiurim on Mishna Berura and Kesses HaSofer—ideal for those learning hilchos STa”M alone and/or for regular chazarah.
Workshops
Learn about the amazing (and complex) process of creating STa”M, taught by experts in the field. True value of a mitzvah comes only through a better understanding of it.
The STAMP Newsletter
STAMP authors and publishes articles for anyone looking to learn more about the Mezuza, Sefer Torah and Tefillin process, industry and basics.
Video Shiurim
Learn essential halachos of STa”M, taught by STa”M experts. Perfect for parents, teachers, and anyone who wants to better understand the mitzvah.
For Professionals
Magiah Training
A professional course training the next generation of magihim—expert checkers responsible for the halachic quality assurance of STa”M—featuring a halachic curriculum, hands-on technical training, and job placement assistance through STAMP’s global network.
Video shiurim
Watch concise explainer videos covering frequently encountered (but not commonly known) hagaha issues. Explore halachos that arise outside of the checking process—such as proper mezuzah placement, damaged tefillin batim, repairing a torn sefer torah and more.
אותיות מחכימות
Read our bimonthly halacha publication (in Hebrew). Every publication includes questions and answers from STa”M experts, writing tips for sofrim, in-depth halachic discussion about every letter, and more.
Certified STa”M from independent sellers
Know exactly what you’re getting
Trust what you bring into your home, your shul, and wear on your arm and head — STAMP approves select independent vendors to sell the STa”M it certifies.
Our Rabbinic Board
Guided by the world’s leading STa”M authorities
The STa”M Project operates under the direct supervision of five of the world’s leading authorities in the field.
Rav Chaim Sperling, shlit”a
The senior member of the STAMP rabbinic board, Rav Sperling has been one of the world’s most sought after magihim (expert checker of STa”M) for nearly 50 years. The Gadol Hador, R’ Yosef Shalom Elyashiv, zt”l, often consulted with Rav Sperling on shaylos STa”M and often asked that he be one of the magihim to check his STa”M.
Rav Moshe Uri Bloi, shlit”a
A sofer for over 40 years, Rav Bloi brings an approach that helps magihim improve their checking skills and sofrim looking to improve their writing. Known for his vast breadth and depth of knowledge of hilchos STa”M, he gives shiurim in a different city every night of the week.
Rav Don Bricker shlit”a
A talmid of both Rav Chaim Sperling shlit”a and Rav Mordechai Friedlander zt”l, Rav Bricker is one of the STa”M industry’s most trusted magihim for nearly two decades. His primary role in STAMP is to oversee the magihim, providing feedback needed to continue honing their expertise.
Rav Reuvain Mendlowitz shlit"a
A talmid of Rav Mordechai Friedlander, zt”l for 13 years, Rav Mendlowitz is one of the field’s top magihim and a primary address for consumers looking for guidance in procuring their STa”M. By authoring the book “Inside STa”M – a Complete Buyer’s Guide,” he laid the foundation for the central theme of STAMP: transparency throughout the STa”M industry.
Rav Yaakov Zions shlit”a
One of the foremost talmidim of Rav Mordechai Friedlander zt”l, Rav Zions is sought after by sofrim and magihim throughout Israel and beyond, for his psak and guidance in all areas of STa”M. He is also the author of “Mishnas Mordechai”, the first-ever sefer published with the Piskei Halacha of Rav Friedlander zt”l. It has quickly become one of the most authoritative seforim on hilchos STa”M.
The STa"M Project was founded by Rabbi Lessin in 5779 (2019)
After growing up in a family that founded and contributed to dozens of Jewish charitable organizations, Rabbi Avraham Yechezkel Lessin received his first certification as a Sofer from Rav Mordechai Friedlander, zt”l, back in 2012.
His ceaseless devotion to making the STa”M industry more transparent and reliable is a timely merging of these two passions.
Today, he offers workshops, shabbosim, lectures and other opportunities for communities interested in learning more about STa”M and the necessity of proper hashgacha.
