Mishneh Torah, Tithes 13-14

Sugya Map

• Issue: The boundary between hefker (ownerless) and demai (doubtful tithing) in the agricultural landscape of Eretz Yisrael.
• Nafka Mina: Whether a consumer must separate terumot and ma'asrot when acquiring produce from unknown sources.
• Primary Sources: Mishneh Torah, Hilchot Ma'aserot 13-14, Mishnah Demai 1:1, Mishnah Demai 1:3.

Text Snapshot

Rambam posits: "Fruits that we can assume to be ownerless... are free from the stringency of demai." Hilchot Ma'aserot 13:1. The nuance lies in the term chezkat (presumption); the exemption is not based on the objective state of the fruit, but on the legal status of the harvest method. If it is gathered from wild growth (hefker), the obligation of tevel never attaches.

Readings

• Kessef Mishneh: Emphasizes that even if a chaver explicitly states the produce is un-tithed, the exemption stands because the root status is hefker. The chiddush is that a verbal statement of "un-tithed" cannot override the chazakah of wild growth.
• Radbaz: Notes that the exemption for "first and last" produce in a valley is utilitarian—since the owner abandons these to the public, they are legally hefker by default.

Friction

• Kushya: If the status of the field (guarded vs. ownerless) is the pivot, why does Rambam later hold that if we have a doubt, we assume the produce grew in the land where it was found? Hilchot Ma'aserot 13:10.
• Terutz: Geography trumps botanical history. The Sages enacted demai on specific regions because the majority of produce there is guarded. Thus, the local chazakah of the region serves as a "legal fiction" that overrides the potential wild origin of an individual fruit.

Intertext

• SA/Responsa: This mirrors the broader principle in Shulchan Aruch, Yoreh De'ah 331 regarding the reliance on chazakot to bypass demai in uncertain market environments.

Psak/Practice

The heuristic is "majority-based localization." If you are in a zone where the vast majority of produce is commercial (guarded), you treat the item as demai. If you are in a wilderness or a region where hefker is the norm, the chazakah of hefker prevails, exempting the consumer.

Takeaway

Halacha manages the uncertainty of the marketplace by prioritizing regional demographics over individual botanical origins. We tithe not because the fruit is tevel, but because the market is demai.