One who set out for a town for which they may make an eruv, but his friend turned him back, he may go, but all the townspeople are prohibited — [these are] the words of R’ Yehudah. R’ Meir says: Whoever is able to make an eruv and does not, he is caught in between.

One who went out of the techum, even one cubit, may not return. R’ Eliezer says: Two cubits, he may return; three cubits, he may not return. One who was overtaken by darkness outside the techum, even one cubit, may not enter. R’ Shimon says: Even fifteen cubits, he may enter; for the surveyors do not give the full measure, because of those who err.