Reference for Bava Batra 23:4

משום דרב יהודה אמר רב דאמר מצר שהחזיקו בו רבים אסור לקלקלו (כדרב גידל דא"ר גידל רבים שבררו דרך לעצמן מה שבררו בררו)

Rabbah b. Bar Hana said in the name of R. Johanan: If the people of a town desire to close alley-ways which afford a through way to another town, the inhabitants of the other town can prevent them. Not only is this the case if there is no other way, but even if there is another way they can prevent them, on the ground of the rule laid down by Rab Judah in the name of Rab, that a field path to which the public have established a right of way must not be damaged.

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