Around 6:15 a.m. on a recent Thursday, Rabbi Moshe Tauber parked his van in the merge lane of the Henry Hudson Parkway at 72nd Street. He turned on his hazard lights and ran out of the vehicle with a flashlight. His wife, Chaya, sitting in the passenger seat, watched anxiously.

Tauber, 51, turned his head upward, shined his flashlight on the nylon fishing wire strung up 30 feet from the ground between two poles, and ran back to the car. All clear — the boundary was unbroken.

For the past 25 years, this process has been the rabbi’s routine on both Thursday and Friday mornings: leaving his home in Monsey, an Orthodox enclave in Rockland County, hours before sunrise in order to circumnavigate the entire island of Manhattan. His mission: to check every part of the borough’s eruv — the sym

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