Mishnah for Bava Batra 2:1
שהוא למעלה מן הגג אבל גג שהוא למעלה מן החצר כופין. ר' יוחנן סבר מימר בחצר שהוא למעלה מן הגג כופין אבל גג שהוא למעלה מן החצר אין כופין:
Come and see, [let us test this hypothesis by implication from our mishnah]: "...from the time that the Kohanim go in to eat their terumah." It is [still close to] daytime. It is as soon as the stars come out!? [and the Tosefta says:] "...from the time when people usually go in to eat their bread on the eve of the Sabbath." That is an hour or two after nightfall! [These are obviously two very different times.] And yet you say: "These opinions are close enough to be equal!?" --Rabbi Yose said: "Let the problem be resolved [by claiming that the Tosefta refers only] to those small villages whose way is to go on up [home] while it is still day, to spare themselves from the animals."