וְהָיָה֙ בַּיּ֣וֹם הַה֔וּא יַחְבֹּ֧ט יְהוָ֛ה מִשִּׁבֹּ֥לֶת הַנָּהָ֖ר עַד־נַ֣חַל מִצְרָ֑יִם וְאַתֶּ֧ם תְּלֻקְּט֛וּ לְאַחַ֥ד אֶחָ֖ד בְּנֵ֥י יִשְׂרָאֵֽל׃ (ס)
And it shall come to pass in that day, That the LORD will beat off [His fruit] From the flood of the River unto the Brook of Egypt, And ye shall be gathered one by one, O ye children of Israel.
Mishnah Eruvin
They measure [the Shabbat limit] only through an expert. If he extended the limit at one point and limited it at another, they observe the place where he extended it. If there was one who made it a greater distance and one who made it a lesser distance, the greater distance is observed. Even a slave and even a female slave are believed when they say, “Thus far is the Shabbat limit”, since the sages did not enact the law in order to be strict but in order to be lenient.