The Shabbos boundary is called the “techum Shabbos” (“techum” for short) and it extends 2,000 cubits around a city in every direction. (A cubit is about a foot and a half.) The Talmud in Eruvin (51a) derives the size of a techum from the 2,000-cubit boundaries around the Levite cities in Numbers 35:5 by means of gezeira shava (identical wording between the two topics).
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