Mesorat%20hashas for Pesachim 4:5

מְקוֹם שֶׁנָּהֲגוּ לַעֲשׂוֹת מְלָאכָה בְתִשְׁעָה בְאָב, עוֹשִׂין. מְקוֹם 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:

In a place where it was the custom to work on Tisha b'Av, they work. In a place where it was the custom not to work, they do not work. And in every place, Torah scholars are idle [from their work that entire day, so that they not take their minds off the mourning.] R. Shimon b. Gamliel says: Let one always "make himself a Torah scholar" (and not work) [and it will not seem ostentatious in him. For one seeing him idle will think it is because he has nothing to do and not because he is prohibiting work to himself.] And the sages say: In Judah they would work on Pesach eve until mid-day, and in the Galil, they would not work at all. [The sages hold that the performance of labor on Pesach eve is not a function of custom. In Judah, it was permitted, and in the Galil it was patently forbidden, and not a function of custom.] As to the night [preceding the fourteenth of Nissan], Beth Shammai forbids [the performance of labor to the men of the Galil (who forbid working on Pesach eve) just as it is forbidden on all other festivals, the night appertaining to the day (that follows)], and Beth Hillel permit it until sunrise, [as with a fast, eating being forbidden in the daytime, and permitted the (preceding) night.]

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