Classes by Mordechai Dinerman

In the spring of 1096, crusading armies swept through the Jewish communities of the Rhineland, leaving devastation in their wake.

This class traces how those events gave rise to rituals of memory.

In the community of Worms, fast days were proclaimed on the 23rd of Iyar and Rosh Chodesh Sivan, accompanied by elaborate mourning customs.

We’ll see how in 1716, when Rosh Chodesh Sivan fell on a Friday, rabbinic authorities clashed over...

In the late 1920s, a Jerusalem rabbi cited an obscure passage describing a certain Rabbi Moshe’s pilgrimage to the Holy Land, including what appeared to be a visit to the Temple Mount itself. He seized on it as proof that going there was halachically permitted.

This sparked a fierce debate over the passage: Was it even credible? Who exactly was this Rabbi Moshe? Did the text actually refer to the Temple Mount? And if a great rabbi ...

Mechiras chametz is today a standard part of observing Pesach. But how did this practice come to be, and how has it evolved over the centuries?

In this class, we analyze the relevant sources in Ashkenazic and Sefardic texts, revealing two distinct approaches to this topic. We’ll then find how the more the sale was refined to accommodate the seller, the more complications it introduced, requiring a series of complex adjustments and,...

There’s a well-known story about Sir Moses Montefiore going up onto Har Habayis during one of his seven legendary trips to Eretz Yisrael.

But once you begin looking into it, you quickly discover that there are several versions of the story, each one telling it a bit differently: when he went up, why he did it, how he did it, and what the rabbinic community’s reaction was.

As we’ll see, a great deal depends on who is telling the sto...

The Mishneh Torah printed in Venice in the 1570s was the product of a broad and deliberate program of censorship. Beyond removing the handful of references to the Christian founder, which we discussed in the prior class, the censors altered many other words and phrases. In some places, entire laws disappear; in others, the language is carefully adjusted to soften its force. In this class, we trace the principles that guided the cen...

In October 1949, The New York Times announced a sensational discovery: an ancient manuscript of Mishneh Torah was discovered and it contained a long-lost provocative passage about the Christian founder. The headline sparked excitement, but the story was riddled with errors. In this class, we trace the real history of that controversial passage and examine when, how, and why it was cut by the censor.

Censoring the Rambam

...

The class follows the paper trail in Rabbi Yosef Caro’s Kesef Mishneh to reconstruct how and when this major commentary actually came into being. After examining its printing history and the author’s stated purpose, the discussion turns to a key flashpoint: whether Kesef Mishneh represents Rabbi Yosef Caro’s final halachic word. We work through the evidence—internal cross-references, page numbers, textual features, and colophons—an...

Today, we explore Jewish life during Prohibition, when the manufacture and sale of alcoholic beverages were banned in the United States. While the U.S. government granted religious exceptions for wine, both the Reform and Conservative movements distanced themselves from this loophole, endorsing the use of grape juice instead. One contemporary posek passionately rejected grape juice, and we’ll examine the central arguments that shap...

This class takes us inside the Jewish wine economy of earlier centuries. We will see communities enforcing price ceilings, outlawing seller collusion, and appointing assessors to protect community members from being overcharged. In some places, the system became so aggressively strict: monopoly-style selling rights, blind tastings, barrels sealed by wine assessors, community-owned measuring jugs, and stiff fines for anyone who trie...

In the mid-1860s, a wave of rabbinic correspondence swept across central and eastern Europe as leading rabbis grappled with a vexing dilemma: how to respond to an antisemitic trial that touched directly on core points of Jewish theology. This case pitted antisemites against Jews, and within the Jewish community, enlightened progressives against traditionalists. Navigating this reality proved deeply contentious.

Isaiah 53 on Tri...

In this class (third of a four-part series), we look at the halachic debate over freeing hostages as it unfolded in Israel during the 1970s. After the September 1970 triple hijacking, several poskim weighed in on whether it was permitted to meet the terrorists’ demands. The discussion resurfaced a few years later after the Yom Kippur War, and then again in the wake of the famous Entebbe raid in 1976.

The Hostage Dilemma: Part III (...

Today, we’re returning to the topic of hostages in Jewish history. Last time, we spent most of our attention on the exceptions to the rule. This time, we’re looking at cases where the Mishnah’s ban on overpaying played at least a partial role in shaping actual halachic decisions and communal policy. And yet, as we will see, the overarching conclusion that we reached in the prior class will hold: overpaying often occurred. And it’s ...

This class takes up one of the most challenging moral questions in Halachah: how far should we go to redeem captives? We’ll look at how this issue unfolded in Jewish communities around the world during the fifteenth and sixteenth centuries—what actually happened, and how the poskim grappled with the Mishnah’s rule against paying more than market value. In a future class, we’ll revisit this topic in the modern context of Israel and ...

In this class, we’ll trace how the sale of mitzvos in shul began, why it caught on, and how it spread across the Jewish world. We’ll look at halachic debates about selling on Shabbos and Yom Tov and at the fiery disputes that erupted over bidding rights, auction miscommunications, and the occasional auctioneer mischief. We’ll also hear from the voices who opposed the practice and what their protests reveal about their communities a...

Ever feel like some piyutim just don’t flow right, as if the stanzas are out of order? Join us for a historical detective journey as we trace the piyut V'chol Maaminim and explore its possible connection to the enigmatic poet Yannai, whose true genius was hidden for centuries. We’ll uncover forgotten clues from the Cairo Geniza and reveal the song’s original, elegant structure. Finally, we’ll explore how key ideas from Chasidus...

Jews have been talking in shul for centuries, and rabbis and communities have tried countless ways to stop it. From twelfth-century Cairo to the Lower East Side in the early 1900s, this struggle has played out across Jewish communities worldwide. This class offers a light yet thoughtful examination of the history of “shul chatter” and how Jews have navigated it through the ages.

The Saga of Shul Shmoozing: A Historical Look at Talk...

In 1827, Czar Nicholas I decreed that Jewish boys and young men be conscripted into the Russian army, a policy that shook Jewish life in Russia to its core. Communities debated and attempted various strategies to confront this crisis, and in that context, the Tzemach Tzedek was asked whether a particular approach was permissible. In this class, we’ll explore the historical backdrop, unpack the Tzemach Tzedek’s responsum, and work t...