Mishnayos Pesachim Perek 4 Mishnah 5

This mishna continues the previous discussion of customs. In a place where people were accustomed to perform labor on the Ninth of Av, one performs labor. In a place where people were accustomed not to perform labor, one does not perform labor. And in all places Torah scholars are idle and do not perform labor on the Ninth of Av, due to the mourning over the Temple’s destruction. Rabban Shimon ben Gamliel says: With regard to the Ninth of Av, a person should always conduct himself as a Torah scholar and refrain from performing labor. Apropos the discussion of performing labor on Passover eve, differences in other customs were cited. And the Rabbis say: In Judea, people would perform labor on Passover eves until midday, and in the Galilee people would not perform labor on Passover eve at all. With regard to performing labor on the night before Passover eve, the night between the thirteenth and fourteenth of Nisan, Beit Shammai prohibit performing labor, and Beit Hillel permit doing so until sunrise.

מָקוֹם שֶׁנָּהֲגוּ לַעֲשׂוֹת מְלָאכָה בְתִשְׁעָה בְאָב, עוֹשִׂין. מָקוֹם שֶׁנָּהֲגוּ שֶׁלֹּא לַעֲשׂוֹת מְלָאכָה, אֵין עוֹשִׂין. וּבְכָל מָקוֹם תַּלְמִידֵי חֲכָמִים בְּטֵלִים. רַבָּן שִׁמְעוֹן בֶּן גַּמְלִיאֵל אוֹמֵר, לְעוֹלָם יַעֲשֶׂה אָדָם עַצְמוֹ תַּלְמִיד חָכָם. וַחֲכָמִים אוֹמְרִים, בִּיהוּדָה הָיוּ עוֹשִׂין מְלָאכָה בְעַרְבֵי פְסָחִים עַד חֲצוֹת, וּבַגָּלִיל לֹא הָיוּ עוֹשִׂין כָּל עִקָּר. וְהַלַּיְלָה, בֵּית שַׁמַּאי אוֹסְרִין, וּבֵית הִלֵּל מַתִּירִין עַד הָנֵץ הַחַמָּה: