Mishnah Eruvin 2

¹They may make posts for wells, [by setting up] four corner-pieces that have the appearance of eight [single posts], the words of Rabbi Judah. Rabbi Meir says: eight that have the appearance of twelve, four corner-pieces and four single [posts]. Their height must be ten handbreadths, their width six, and their thickness [may be] of any size whatsoever. Between them [there may be] as much [space as to admit] two teams of three oxen each, the words of Rabbi Meir. Rabbi Judah says: [two teams] of four [oxen each] . [These teams being] tied together and not untied, [enough for] one to enter while the other goes out. ²It is permitted to bring [the posts] close to the well, provided that a cow’s head and the greater part of its body can be within [the enclosure] when drinking. It is permitted to remove [the posts] to any [distance] provided one increases the posts. ³Rabbi Judah says: [the enclosure may be only] as large as two bet se'ah. They said to him: they only prescribed [the limit of] two beth se’ah for a garden or a karpaf only, but if [the enclosure] was a pen, or sahar, a backyard or courtyard even if it is five or ten bet kor, it is permitted. And it is permitted to remove [the posts] to any [distance] provided one increases the posts. ⁴Rabbi Judah says: if a public road cuts through them it should be diverted to one side; But the sages say: this is not necessary. Both for a public cistern, a public well as well as a private well, they may make [an enclosure] of posts, but for a private cistern, they must make a partition ten handbreadths high, the words of Rabbi Akiva. Rabbi Judah ben Baba says: they make [an enclosure] of posts for a public well only while for the others they must make a belt ten handbreadths high. ⁵Rabbi Judah ben Bava further said: a garden or a karpaf whose [area does not exceed] seventy cubits and a fraction by seventy cubits and a fraction, which is surrounded by a fence ten handbreadths high, it is permitted to carry within it, provided there is in it a watchman’s hut or a dwelling place or it is near to a town. Rabbi Judah says: even if it contained only a cistern, a ditch or a cave it is permitted to carry within it. Rabbi Akiva says: even if it contained none of these it is permitted to carry within it, provided its area [does not exceed] seventy cubits and a fraction by seventy cubits and a fraction. Rabbi Eliezer says: if its length exceeded its breadth even by a single cubit it is not permitted to carry within it. Rabbi Yose says: even if its length is twice its breadth it is permitted to carry within it. ⁶Rabbi Ilai said: I heard from Rabbi Eliezer, even if it is as large as a bet kor. I also heard from him that if one of the residents of a courtyard forgot to join in the eruv, his house is forbidden to him for taking in or taking out any object but it is permitted to them. I also heard from him that people may fulfill their duty [for bitter herbs] at Pesach by eating hart’s tongue (akrevanim). I went round among all his disciples seeking a fellowstudent but I found none.