Classes by Mordechai Dinerman

Today, we’ll examine the debate in Venice in 1630 over a communal ban against gambling. Local leaders moved to outlaw games of chance, but Rabbi Yehuda Aryeh Modena pushed back, arguing that the community had no right to restrict a Jew’s freedom in this area. Along the way, we examine the authorship of an anonymous 1595 dialogue on gambling, offering an overview of the halachic arguments and a win...

In 1725, Rabbi Zalman Hena published Shaarei Tefilah and sparked controversy by calling for a complete stop to the use of taam ha’elyon—the unique system of trop traditionally used for reading the Aseres Hadibros. Rabbi Yaakov Emden wasn’t having it and fired back forcefully in his Luach Eresh. This class unpacks their debate, the sources they cite, the Alter Rebbe’s position, and what we know abo...

Today, we’re picking up where we left off in the story of chidush hasemicha. We’ll look at what unfolded after Rabbi Levi ibn Chabib pushed back against Rabbi Yaakov Beirav’s plan and how the controversy evolved in the decades that followed. We’ll dive into Rabbi Yosef Caro’s role in the debate and then turn to the remarkable mission in the 1830s, spearheaded by Rabbi Yisrael of Shklov, to find th...

After the Spanish Expulsion, a group of leading rabbis in Tzfas, led by Rabbi Yaakov Beirav, set out to revive  semichah —the original form of judicial ordination that linked back to Moshe Rabbeinu. They planned to reestablish semichah through broad rabbinic consensus, but not everyone was on board. In Jerusalem, Rabbi Levi ibn Chabib strongly objected, raising serious questions about the halachic...

There’s a long and painful history of the Gemara being censored in Christian lands, but in 1728, a draconian form of censorship led to the publication of a heavily redacted  Maseches Berachos . A fierce debate erupted within the Jewish community: was it better to print a mutilated Gemara, or not to print it at all? In this class, we explore the rabbinic voices on both sides, the arguments they adv...

Sometime in the mid-1400s, Rabbi Shlomo Duran of Algiers penned a remarkable  teshuvah  directed at a group of conversos in Spain. These individuals, who had been forced to embrace Christianity since the 1391 persecutions, had managed to maintain their Jewish faith in secrecy. Their question centered on how they could refrain from the worst forms of chametz on Pesach without drawing the suspicion...

In the 1850s, a groundbreaking innovation was introduced in Galicia: machines to facilitate matzah production. What followed was a fierce and dramatic conflict that shook the Jewish world. Pamphlets were published on both sides, each defending its position with vigor, leading to intense debates over halachah, minhag, and economic policy. In this class, we jump into the heart of the controversy as...

The Alter Rebbe’s unique script for  safrus  has a rich and winding history. It has been inked, shelved, revived, and debated—and everyone seems to have an opinion. So, what is the story behind this  ksav ? What sets it apart? Why do some embrace it wholeheartedly while others remain unsure? This class explores its historical trajectory, some of its writing nuances, and the ongoing conversation ar...

In the mid-12th century, the Almohads swept across North Africa and Spain, driven by a vision of a strictly unified Muslim society. For the Jewish communities under their rule, the choice was stark and unforgiving: convert, flee, or face death. Many outwardly embraced Islam while secretly maintaining their Jewish faith. A rabbi from afar denounced these covert Jews, insisting that their hidden dev...

In the 1170s, the Jewish community in Yemen faced an existential crisis: a radical ruler forced them to convert to Islam, an apostate Jew spread anti-Jewish propaganda, and a self-declared Messiah sowed confusion. In response, the Rambam penned one of his most powerful letters, offering guidance and encouragement. As we approach the 44th Siyum HaRambam, we revisit this extraordinary letter, its hi...

In the 1470s, a series of outrageous blood libels were leveled against Jewish communities in the Germanic lands, including one in Regensburg. To secure their acquittal, the Jews of Regensburg needed an enormous sum of money—far beyond their means. The rabbis gathered in Nuremberg to strategize and ultimately turned to Rabbi Yosef Colon in Pavia with a pressing question: Could they obligate all Jew...

On the fifteenth of Shevat, 1348, in the city of Tudela, a man named Yosef performed kidushin with a young woman named Belita. What began as a seemingly ordinary wedding ceremony quickly became a shocking controversy. People who were present asked Belita whether she was truly consenting, and instead of her confirming, it was her father who spoke on her behalf. Further investigation revealed that B...

Rabbi Shlomo ben Aderes, the legendary rabbi and leader of Barcelona, received countless questions during his tenure, many of which have been preserved to this day. In this class, we discuss six compelling cases of tax disputes. They reveal remarkable insights into the political and economic realities of the time, the dynamics within Jewish communities, and their interactions with the surrounding...

The book known as Yosifun, cherished in traditional Jewish circles, and the books of Josephus, preserved in Greek and Latin by non-Jewish hands, spark challenging questions about authorship, reliability, and reconstructing the Jewish past. This class explores how rabbis throughout the ages evaluated these works, their role on the Jewish bookshelf, and how to navigate the apparent discrepancies bet...

The Books of Maccabees tell the dramatic story of the Chanukah revolt and the heroism of the Jewish fighters. But who wrote these books, and why were they left off the Jewish bookshelf? We’ll discuss the history of these texts, explore their reception among Jews throughout the ages, and probe the role they played—or didn’t play—in shaping Jewish memory of the Chanukah story. Lost Lights of Chanuka...

When a shipwreck in the 1500s left families wondering about the fate of their loved ones, rabbinic authorities debated whether the wives of the missing passengers could remarry. This centuries-old question resurfaced in 1912 with the famous sinking of the Titanic, reigniting the discussion of applying Halachah in tragic circumstances. The Titanic Question: The Halachic Dilemma of Men Lost at Sea

We kick things off with seven fascinating stories from the teshuvos of medieval Spain, where we discover shul seats being treated like real estate: bought, sold, inherited, mortgaged—and sometimes the center of heated disputes. Then, we shift our focus to Ashkenaz, where this phenomenon is noticeably absent, suggesting a very different set of attitudes and conventions about shul seats. Finally, we...

In the 1630s, pioneering Jewish immigrants in Brazil asked when they should daven for rain, given that their seasons were reversed from those in Europe. Their question sparked a fascinating rabbinic debate that takes us back to a dramatic showdown in 14th-century Toledo, which continues to resonate today. Join us as we explore how Halachah navigates the balance between tradition and reality. The C...

In 1848, a man in Jerusalem on a journey to Judaism was devastated when told he must desecrate Shabbos because, despite undergoing a bris, he wasn’t yet considered Jewish until completing the final step of immersion. His heartbreak ignited a halachic controversy, which we’ll explore in this class. We’ll uncover the identities of the key figures involved and delve into the moving story of a man wil...

As we mark the 60th anniversary of the Lubavitcher Rebbe’s sichos on Rashi, we will dive into how the Rebbe engaged with some of the earliest print editions and medieval manuscripts of Rashi’s commentary. These unique editions often reveal variant readings of Rashi’s words, each with its own story to tell. Through this journey, we’ll gain a deeper appreciation for Rashi’s foundational commentary—a...

Why has the Chabad community favored esrogim from Calabria? In this class, we’ll explore the backstory, diving into the halachic debates about grafted esrogim and why they matter. We’ll also take a closer look at the big discovery in 1955—when it turned out that even Calabria esrogim weren’t completely immune to grafting—and what that meant moving forward. We’ll unpack the history and the question...

From the Cairo Geniza, we uncover an ancient Judeo-Arabic rabbinic essay offering unique insights into the history and development of the Jewish calendar, particularly the observance of the second day of yom tov outside the Land of Israel. As we delve deeper, this document emerges as part of a broader debate, addressing the Karaites’ opposition to the two-day yom tov tradition. By comparing this t...

In this class, we will analyze four beautiful  piyutim  that we chant on Rosh Hashanah and Yom Kippur, uncovering some structural oddities along the way. As we raise questions and examine older prints and medieval manuscripts, we’ll uncover a story of mysterious censorship. While we’ll piece together what happened, understanding why it happened will prove to be more challenging.   Links: Machzor,...

In this episode, we’re diving into fascinating early 16th-century woodcut images and priceless medieval machzor manuscripts to see how they portray the mitzvah of blowing the shofar. We’ll explore the unique details in these images that reveal interesting  minhagim  of the time, though some might leave us with more questions than answers. Let’s uncover the stories these images tell about our tradi...

In the 1860s, European Jewish communities faced a unique halachic challenge: the arrival of new chicken breeds from distant lands. As these exotic fowl entered the marketplace, rabbis debated their kosher status, igniting an adjacent discussion on how and why the turkey became accepted as kosher. Fowl Play: The Great Turkey-Chicken Debate of the 19th Century