Related for Eruvin 4:11

מִי שֶׁיָּצָא חוּץ לַתְּחוּם, אֲפִלּוּ אַמָּה אַחַת, לֹא יִכָּנֵס. רַבִּי אֱלִיעֶזֶר אוֹמֵר, שְׁתַּיִם, יִכָּנֵס, שָׁלֹשׁ, לֹא יִכָּנֵס. מִי שֶׁהֶחְשִׁיךְ חוּץ לַתְּחוּם, אֲפִלּוּ אַמָּה אַחַת, לֹא יִכָּנֵס. רַבִּי שִׁמְעוֹן אוֹמֵר, אֲפִלּוּ חֲמֵשׁ עֶשְׂרֵה אַמּוֹת, יִכָּנֵס, שֶׁאֵין הַמָּשׁוֹחוֹת מְמַצִּין אֶת הַמִּדּוֹת, מִפְּנֵי הַטּוֹעִין:

If one went outside the tchum, even one cubit, he may not enter (the tchum). [He has only four cubits on either side. And even though these four cubits are "swallowed up" within the tchum of the city, we do not say "once he has entered, he has entered," for he holds that the "swallowing up" of t'chumin is of no account.] R. Eliezer says: (If he went outside) two (cubits), he may enter; three, he may not enter. [R. Eliezer is consistent with his view (4:5): "And he, in the middle"; i.e., at the end of two thousand cubits, he has four cubits: two on one side, within the tchum, and two on the other side, outside the tchum. Therefore, if he is standing in the second cubit (outside the tchum), he may enter. For the "swallowing up" of t'chumin is of account. The halachah is not in accordance with R. Eliezer.] If darkness descended upon one outside the tchum [i.e., If he were on the road, and darkness descended upon him outside the tchum], even one cubit, he may not enter. [For he did not acquire habitation in his place, having shown that he did not wish to do so; and he did not acquire habitation in the city, there being more than two thousand cubits between himself and the city. Therefore, he has only four cubits, as one who has left the tchum.] R. Shimon says: Until fifteen cubits [Not precisely, but also a little more or less. (Some interpret it as precisely fifteen. I have not been able to construe this well)]; for the surveyors [those who measure the t'chumin of cities and make a sign for the end of the tchum] do not measure exactly, because of those who err. [They do not mark the tchum exactly at the end of two thousand cubits, but within that distance, because of those who err, not recognizing the marking and sometimes unknowingly going beyond it and returning. Because of this, they (the surveyors) always marked within the two thousand, so that these fifteen cubits are found to be within the tchum. And because he (one who went beyond that limit) did so in error, he was permitted to return; and they were not stringent with him as they were with one who went outside the tchum, who should have taken heed not to do so. The halachah is not in accordance with R. Shimon.]

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