Devarim 19: Encroachment! Five Yard Penalty

“You shall not move your neighbor’s landmarks, set up by previous generations, on the property that will be allotted to you in the land that your God is giving you to possess” (verse 14).לֹא תַסִּיג גְּבוּל רֵעֲךָ אֲשֶׁר גָּבְלוּ רִאשֹׁנִים בְּנַחֲלָתְךָ אֲשֶׁר תִּנְחַל בָּאָרֶץ אֲשֶׁר ה׳ אֱלֹהֶיךָ נֹתֵן לְךָ לְרִשְׁתָּהּ(Deuteronomy 19:14)This verse prohibits someone from moving their boundary into their neighbor’s yard in order to increase their own property. Rashi asks: if there is already a general prohibition against stealing, why does the Torah need this additional commandment? He answers that one who moves a boundary violates two prohibitions—the general prohibition against theft and the specific prohibition of hasagat gevul (encroaching on boundaries).Rashi further explains that this commandment is unique to the Land of Israel. If someone were to move a boundary outside the land, they would violate only the prohibition of theft, not this specific commandment. As the people are about to enter the land, it makes sense that Moshe would emphasize a prohibition uniquely tied to land ownership.But why have this second transgression at all? The delineation of tribal boundaries was a major theme in the Book of Numbers. Recall that the daughters of Tzelofchad—and later other members of the tribe—were deeply concerned with property lines and the proper protection of familial estates. This additional prohibition functions as a kind of “belt and suspenders” safeguard, reinforcing stability and preventing conflict over land.This rule is later expanded by the Rabbis to include economic encroachment, such as competing businesses intruding on the livelihood of an established business. While this could sound like a mechanism for enforcing monopolies, halakhic authorities introduce important limits.Rav Moshe Isserlis (the Rema) writes:“There are those who say that the ability of residents to prevent a business from another place is only when there will be no loss to the consumers—meaning that the newcomer would sell the same goods, at the same price, and of no better quality. But if the newcomer would sell at lower prices, or the goods would be better, then the consumers benefit, and the original residents may not prevent him… And similarly, if the newcomer brings a product not previously available, even if it is not cheaper or better, he may not be prevented.”(Rema on Shulchan Aruch, Choshen Mishpat 156:5)The Rabbis therefore sought to strike a careful balance: protecting boundaries and livelihoods on the one hand, while also safeguarding the broader community’s interests by allowing fair and beneficial competition.