Rabbi Heschel Greenberg has launched a new series of classes on the Rambam’s Mishneh Torah in response to the Rebbe’s call to learn at least one halacha in depth.

The Rebbe initiated a major effort to unite all Jews with the study of the entire encyclopedic work, Mishneh Torah, by learning three chapters a day and completing the entire work in less than a year. Alternatively, one can learn one chapter and complete the entire Mishneh Torah in close to three years. The Rebbe also gave a third option to study Maimonides’ companion work, Sefer Hamitzvos that parallel the Mishneh Torah.

In addition, the Rebbe requested that we learn one halacha in depth.

We recently began the 46nd cycle of Mishneh Torah which inspired Rabbi Greenberg to record brief classes on selected passages of the Mishneh Torah.

Rabbi Heschel Greenberg is a shliach of the Rebbe in Buffalo NY and the Director of the Jewish Discovery Center, and, for over 50 years, has taught thousands of classes on all aspects of Jewish knowledge.

Rabbi Greenberg has also authored dozens of works on diverse subjects including several volumes of commentary on the Mishneh Torah.

Many of Rabbi Greenberg’s classes can be accessed on his website rabbigreenberg.com.

In this short but razor-sharp installment we open Hilchos Tum’as Meis, Perek 15, Halacha 3 and watch Rambam turn the most insignificant scraps into powerful barriers. A window between two rooms is less than a tefach? Fill that gap with less than a kezayis of corpse flesh, less than a kezayis of nevelah, a bone smaller than a se’orah, a sheretz smaller than a lentil, or non-muchshar food smaller than a beitzah – and the tuma stops cold. Why? Because these items are both tahor (they cannot contract or transmit tuma) and insignificant in the owner’s eyes; therefore he has no intention of removing them. That combination of ritual purity plus practical permanence turns them into a valid chatzitzah.