Classes by Mordechai Dinerman

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

In the 1970s, a Chabad journal in Israel published a story about the Alter Rebbe reversing a halachic ruling based on a dream, sparking significant controversy. This incident opens the door to a fascinating exploration of a practice that was surprisingly common among Ashkenazic rabbis in the 12th and 13th centuries—using dreams to guide halachic decisions. Dreams of Revision: The Role of Dreams in...

In the 1830s, Rabbi Tzvi Hirsch Kalischer penned an extensive letter to one of the Rothschilds, seeking his support for an ambitious plan to reinstate the korbanos on the Temple Mount. The rabbi contended that awaiting Moshiach was neither necessary nor prudent. This proposal ignited a debate among his rabbinic contemporaries, a discourse that continued well into the 20th century. Today, this stor...

As we approach Gimmel Tammuz, marking the Rebbe’s thirtieth Hilula, we’re doing something different: a text-based class on an important talk by the Rebbe from Shabbos Korach 1988, a talk that captures a lot of the Rebbe’s hashkafah. The aim is to find inspiration and wisdom in his words, which can be applied to our daily lives and shared with others. Unconditional Love: A Commemorative Study of a...

Rabbi Yisrael Lifshitz, a well-known commentator on the Mishnah, included a provocative legend about Moshe Rabbeinu in his writings, suggesting that Moshe naturally possessed negative character traits. Over the following decades, some rabbis strongly opposed this legend, arguing that its claims were baseless and defamed Moshe’s revered image. In this class, we’ll talk about the origins of this con...

The Baal Shem Tov passed away on Shavuos in 1760, but the exact day of his passing and the time and manner of his burial have long been subjects of controversy and mystery. In this class, we explore this subject by learning about two major debates regarding yom tov burials that emerged during the Middle Ages. Through this journey, we aim to deepen our appreciation for the laws and values related t...

How does a halachic mind interpret the harrowing events at Masada, where Jewish rebels chose death at their own hands over surrender? In this class, we delve into this question, exploring not only the tragic case at Masada but also similar ethical dilemmas faced by Jews during the Middle Ages when confronted with forced conversions under Christian rule. The complexities of these historic moments o...

Throughout history, Jewish communities have thrived in diverse locales, each presenting unique agricultural schedules. While adhering to the prohibition against eating chadash proved feasible in some regions, in others, it posed significant obstacles to daily life. This class delves into the strategies employed by the Ashkenazi rishonim and the legendary Acharonim of Poland, exploring five approac...

In 1759, a clandestine faction of Shabetai Tzvi’s followers in Poland committed a startling act: they collectively converted to Christianity while simultaneously accusing Jews of the age-old fabrication of using blood in matzah production. Despite the longstanding existence of the blood libel, this marked the first instance where the accusation was made by citing and distorting Talmudic and halach...

The Kittsee Haggadah The library of Agudas Chasidei Chabad houses a remarkable manuscript crafted in 1760 by the talented scribe and artist Chaim ben Asher Anshel of Kittsee, near present-day Bratislava. We’ll trace the journey of this Haggadah from its creation to its acquisition by the Frierdiker Rebbe. Opening this manuscript, we’ll examine its layout, artwork, nusach, and style of nikud, seeki...

In the year 1550, two non-Jewish printers published competing editions of Rambam’s Mishneh Torah. One of them partnered with an esteemed rabbi from Padua, who, in his quest for support, turned to Rabbi Moshe Isserlis. Rama’s response along with a careful examination of the printed volumes unveil the details of this dispute. Rama’s scholarly answer also sheds light on various areas of commercial Ha...

There have been tragic instances where Jewish women felt compelled to take drastic measures to save the lives of their fellow Jews. When rabbis were presented with these real-life cases, they turned to the story of Esther for inspiration and guidance. Seduction and Sacrifice: From the Purim Story to the Responsa Literature

Today, we explore enigmatic Megilahs, where the absence of the text eclipses the written word. We’ll learn that this peculiar phenomenon is just a fragment of a larger tendency reflected in the Geniza to produce incomplete texts. We shall unravel the motivations behind this practice, reminding us of the formidable challenges in reproducing sacred texts by scribal hand.   Links: First Megilah image...

Tunisian Jews used to refer to Tanach with a very odd name, and few understood why. Fortunately, illuminated medieval Jewish manuscripts can help solve this mystery. They bring us back to the 14th century, where we find Rabbi Yitzchak ben Moshe Halevi fervently contending that there has been a neglect of studying Tanach and that this is akin to abandoning the sacred Beis Hamikdash. Lost Scrolls, L...

When we examine medieval manuscripts that feature Aleinu, we uncover intriguing instances of censorship within this ancient prayer. What motivated these textual alterations, and can they be linked to a specific historical event? Delving into this subject unveils a significant episode from the year 1390, shedding light on the numerous amendments and erasures made to the text. These changes continue...

Favorite Episodes Are our dreams significant? Do they have predictive value? Should we pay heed to their warnings? The Talmud seems to offer contradictory teachings on this subject, and this will lead us toward two classic approaches to this matter. The Meaning of Dreaming: Talmudic Perspectives

Click here to view the class PowerPoint slides. Favorite Episodes | Initially released in July 2023. We are all acquainted with the renowned depiction of the menorah created by the Rambam. In this class, we dig into the story of this image. Where did it come from? Can we trust its accuracy? When was it discovered? Did later artists and copyists treat it as just a doodle or something more meaningfu...

Favorite Episodes | Initially released in December 2022. We can learn about the public presence of women in a given society by examining how various rabbis understood the story of Dina. We’ll witness the difference between Ashkenazic and Sefardic commentaries, between the Tanchuma and Bereishis Rabah, and between Ashkenazic and Sefardic halachic norms. Between Ashkenaz and Sefard: Medieval Women,...

In this episode, we explore the intriguing narrative of a Jew named Shlomo, also known as Fillipo, who found himself ensnared by the Inquisition in Venice during the 1580s. Raised as a Christian in Portugal during a period when Jews were prohibited from residing there, Shlomo’s journey took a profound turn when he embraced Judaism in Venice, a choice that carried substantial risks. His captivating...