Classes by Mordechai Dinerman

We are used to seeing two Yudin as a substitute for G-d’s ineffable name. But it wasn’t always that way. Spelling Hashem’s Name in Hebrew Manuscripts

By examining the liturgy and art in a tiny medieval machzor, we learn how hearing the Aseres Hadibros was experienced seven hundred years ago, and how it's both similar and different today. Shavuos Art, and the Strange History of Akdamus

Why animal heads replace human heads; why the luchos morph into a Torah scroll; and the origins of the areinfirenish and dairy on Shavuos. Shavuos Through the Lens of Historic Jewish Art

Many assume that "explaining" and "Holocaust" are never to be seen in the same sentence. How did we get here? And was it always this way? Explaining the Holocaust? Multiple Approaches by the Frierdiker Rebbe and Rebbe

We can document how the Mishneh Torah was drafted, finalized, updated, disseminated, illuminated, critiqued, printed, and censored. Mishneh Torah: A Biography

The Cairo Geniza unveils much about Rambam’s communal activism, teaching, authorship, lost works, and overall life. The Cairo Genizah: Shedding Light on the Life and Works of the Rambam

The final class of the series, in which we introduce Rambam’s position, Chasidic sources, and wrap up the topic with the key takeaways. A Jewish Guide to Horoscopes and Astrology (Part 3)

A leaked draft suggests that the highest court of the land is primed to overturn one of the most controversial cases in American history. It’s time to revisit what Halachah has to say on the topic of abortion and the beginning of life. Overturning Roe v. Wade: Good for the Jews?

Continuing to explore astrology from a Jewish perspective. What are the theological problems with accepting astrology and how did the rabbis address this? We will discover a range of opinions about how easy or difficult it is to subvert an astrological outcome. A Jewish Guide to Horoscopes and Astrology (Part 2)

The background and origins of red strings, kinora , and “poo-poo”; Rambam’s position on the matter; and two models for how Jews understood this mysterious phenomenon. A Jewish Guide to the Evil Eye

Continuing our series of classes on Judaism and the paranormal, this class begins a three-part deep dive into the topic of astrology. As with all of these mysterious topics, two divergent pathways emerge. A Jewish Guide to Horoscopes and Astrology (Part 1)

Do demons exist? Did they ever exist? Is adultery with a demon considered adultery? (Yes, poskim addressed that question.) Jewish sources are not of one voice on this topic. A Jewish Guide to Demons and Spirits

Some of the greatest Torah sages lived in Egypt even as the Talmud ruled that this was forbidden. Over the years, numerous justifications have been provided. Which will resonate with you? Blatant Disregard of a Torah Law? On the Prohibition Against Settling in Egypt

While the kabbalists embraced the concept of reincarnation, other rabbis were skeptical. What lies at the root of this dispute? And how did the kabbalists address the various challenges raised about this doctrine? Dominating Wives, Suffering, and Reincarnation: The Debate About Gilgul  and It’s Connection to Pesach

Since ancient times, Jews have been falsely accused of killing non-Jews for ritual purposes. In medieval Europe, beginning in the twelfth century, this was often accompanied by accusations that Jews used their victims’ blood to bake matzah for the Jewish holiday of Passover. This ridiculous but deadly lie would eventually lead to subtle Talmudic Censorship. The Blood Libel and Talmudic Censorship

Medieval illuminated Haggadahs shed light on how the observance of the past was both similar to and different from the present. Taking this journey is an excellent way to review some of the laws and customs of Pesach. The Old, the New, the Forgotten: Halachah and Minhag In Haggadah Art

Every so often we hear of someone who is blessed with a true windfall. In such instances, we often find multiple parties claiming a stake in the bonanza. How do we determine ownership when there are conflicting claims to life’s valued surprises? Finders Keepers? Halachic Implications From Tzaraas In the Home

The Story of the Haggadah is synonymous with the story of the Jewish people. Observe how this most famous Jewish liturgical work has evolved in its appearance from one generation to the next. Yes, things do change, but they also stay the same. Evolution of the Haggadah: A Pictorial History, from the Cairo Genizah, to the Medieval Art Workshop, to the Modern Printing Press

Continuing to explore whether there can ever be a time when mitzvos are suspended, and how this relates to the mysterious teaching that the pig will one day become kosher. Kosher Pig? Analyzing a Mysterious Midrash  (Part 2)

Is it appropriate for a Jew to eat kosher imitation bacon, crab, or shrimp? Is this undermining the spirit of Kashrus? Central to the contemporary discussion is a fascinating Talmudic passage about a conversation between Yalta and Rav Nachman, which deserves analysis and exploration.  The Letter and Spirit of the Law vis-a-vis Imitation Products

There’s a well-known tradition that it will be permissible for Jews to consume the meat of a pig when Moshiach comes. What is the source for this teaching and what is its logic? Can there ever be a time when mitzvos are suspended? There are multiple approaches to these questions. Kosher Pig? Analyzing a Mysterious Midrash (Part 1)

The Jews throughout the ages who employed art to depict the Purim story left us a legacy rife with messaging. Synagogue walls, biblical manuscripts, and medieval machzorim can teach us a lot about what Purim used to mean and what it can still mean today. Purim Through the Lens of Historic Jewish Art

One of the most important commentaries on Megilas Esther was authored by Rabbi Shlomo Halevi Alkabetz (d. 1576), the famed author of Lecha Dodi. We explore eight memorable teachings from Manos Halevi and examine how they are cited and explained in Chabad sources. Purim Class - The Manos Halevi by Rabbi Shlomo Alkabetz: Overview and Highlights

The Czarist regime forbade rabbinical courts from employing coercive measures and adopted policies to promote assimilation. This led to the censoring of Jewish texts, and a recent discovery has shown that this also affected the Alter Rebbe’s Shulchan Aruch. Rabbinic Police Powers, Love and Hate, and Stern Censorship: Insights from Newly Discovered Passages of the Alter Rebbe’s Shulchan Aruch 

For centuries, Halachic authorities have debated how to designate Christian theological beliefs. In recent weeks, a new manuscript of the Alter Rebbe’s Shulchan Aruch has surfaced, providing us with an important new voice in this conversation. The Halachic Status of Christianity: Insights from Newly Discovered Passages of the Alter Rebbe’s Shulchan Aruch