במדבר, פרק ט״ו, פסוק י״ח

Entering the Land of Israel marks a profound shift for the Israelites, transitioning from a desert existence sustained by miraculous manna to a life of natural agriculture. This new reality brings with it specific commandments tied to the land, most notably the requirement to separate a portion of dough. This act serves as a bridge, connecting the material harvest with gratitude to God.

The primary approach among commentators notes a unique urgency to this requirement. While other land-based commandments only took effect after the Israelites fully conquered and divided the territory, the obligation to separate dough applied immediately upon their arrival [רש״י, ברטנורא, ביאור יש״ר, גור אריה]. However, the practical application did not begin the very moment they crossed the Jordan River. Rather, the actual practice commenced when the heavenly manna finally ceased falling on the sixteenth of Nissan, and the people began eating the local harvest [משכיל לדוד, ברכת אשר, מגלה עמוקות].

Beyond the immediate timing, commentators find an additional, collective condition for this duty. The requirement inherently depends on the presence of the entire nation in the land, rather than just individuals or a partial population [תורה תמימה, הכתב והקבלה]. This detail carries a major historical consequence. Centuries later, during the return to Zion led by Ezra the Scribe, only a fraction of the exiled population came back. Because the entire nation was not present, the original biblical requirement expired. From that point onward, the practice of separating dough has been observed solely by rabbinic decree [רש ר הירש, תורה תמימה].

The geographical scope of this duty is also strictly defined, existing exclusively within the borders of the Land of Israel. Consequently, local produce taken outside the land is exempt, whereas grain brought from other countries into the land becomes subject to the requirement [תורה תמימה, מלבי״ם]. Finally, the scope of the food itself is specific. The duty does not apply to just any baked good; it is strictly limited to dough kneaded from the five species of grain, as these are the defining ingredients of true bread [רלב״ג].