Reference for Eruvin 5:8

אַנְשֵׁי עִיר גְּדוֹלָה מְהַלְּכִין אֶת כָּל עִיר קְטַנָּה, וְאֵין אַנְשֵׁי עִיר קְטַנָּה מְהַלְּכִין אֶת כָּל עִיר גְּדוֹלָה. כֵּיצַד. מִי שֶׁהָיָה בְעִיר גְּדוֹלָה וְנָתַן אֶת עֵרוּבוֹ בְעִיר קְטַנָּה, בְּעִיר קְטַנָּה וְנָתַן אֶת עֵרוּבוֹ בְעִיר גְּדוֹלָה, מְהַלֵּךְ אֶת כֻּלָּהּ וְחוּצָה לָהּ אַלְפַּיִם אַמָּה. וְרַבִּי עֲקִיבָא אוֹמֵר, אֵין לוֹ אֶלָּא מִמְּקוֹם עֵרוּבוֹ אַלְפַּיִם אַמָּה:

The men of a large city traverse an entire small city [If a small city were within its two thousand cubits, and they walk through it, they traverse the entire small city as if it were four cubits and complete the measurement outside it.], but the men of a small city do not traverse an entire large city [as if it were four cubits. For the measurement of its tchum ends within the large city, for which reason they may go only until the termination of their tchum.] How so? If one were in a large city and he placed his eruv in a small city; or, if he were in a small city and he placed his eruv in a large city, he traverses all of it, and outside it, two thousand cubits. [Our Mishnah is defective. This is what was taught: "The men of a large city traverse an entire small city, but the men of a small city do not traverse an entire large city. When is this so? When he measures two thousand cubits. But if he places his eruv within the city — whether the men of a large city place their eruv in a small city, or the men of a small city place their eruv in a large city, they traverse the entire city in which the eruv were placed as if it were four cubits. How so? If one were from a large city and he placed his eruv in a small city, etc."] R. Akiva says: He has only two thousand cubits form the place of his eruv. [He differs with the first tanna and holds that the eruv does not cause the city in which it is placed to be regarded as four cubits, and the two thousand cubits are counted only from the place of the eruv. The halachah is not in accordance with R. Akiva.]

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