For the source text click/tap here: Moed Katan 3
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Just like the laws of Shabbat have Avot (primary activities that are forbidden) and Toladot (secondary activities – see Massekhet Shabbat ),
Similarly, the laws of shemitta have both Avot and Toladot.
The Avot are the agricultural activities that are specifically listed in the Torah (see Lev 25:4-5) as being forbidden during the Sabbatical year, primarily activities of planting, pruning and harvesting.
We explore the halachot of shemittah and the thorny issue of the Heter Mechira originated by Harav kook zt'l