Mishnayos Pesachim Perek 4 Mishnah 4

The mishna cites another custom related to Passover. In a place where people were accustomed to eat roasted meat on Passover evenings, outside of Jerusalem or after the Temple was destroyed, one may eat it. In a place where people were accustomed not to eat outside Jerusalem, one may not eat it. The mishna discusses additional differences between local customs. In a place where people were accustomed to kindle a lamp in the house on Yom Kippur evenings, one kindles it. In a place where people were accustomed not to kindle a lamp, one does not kindle it. However, even in a place where the custom is not to kindle lamps in houses, one kindles in synagogues and study halls, in deference to these places. Similarly, lamps should be kindled in dark alleyways, so people will not be hurt, and next to the sick.

מָקוֹם שֶׁנָּהֲגוּ לֶאֱכֹל צָלִי בְלֵילֵי פְסָחִים, אוֹכְלִין. מָקוֹם שֶׁנָּהֲגוּ שֶׁלֹּא לֶאֱכֹל, אֵין אוֹכְלִין. מָקוֹם שֶׁנָּהֲגוּ לְהַדְלִיק אֶת הַנֵּר בְּלֵילֵי יוֹם הַכִּפּוּרִים, מַדְלִיקִין. מָקוֹם שֶׁנָּהֲגוּ שֶׁלֹּא לְהַדְלִיק, אֵין מַדְלִיקִין. וּמַדְלִיקִין בְּבָתֵּי כְנֵסִיּוֹת וּבְבָתֵּי מִדְרָשׁוֹת, וּבַמְּבוֹאוֹת הָאֲפֵלִים, וְעַל גַּבֵּי הַחוֹלִים: