Tikvah
Editors’ Pick

October 28, 2025

The Rabbi with One of the Hardest Jobs in Jewish Law Gets Some High-Tech Assistance

Sensors for the Manhattan eruv.

To skirt the prohibition on carrying items outside on the Sabbath, ancient rabbis developed an elaborate legal fiction called an eruv (from a phrase meaning “the merging of courtyards”), which usually is a virtual wall consisting of string and wire that serves to enclose part of a city. The laws of the eruv are considered some of the most difficult in the talmudic corpus, and the eruv in Manhattan might involve the most intricate application of these laws. In charge of inspecting it every week is Rabbi Moshe Tauber, the only person fully aware of all its intricacies. But he has recently gotten some high-tech assistance. Jackie Hajdenberg writes:

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