לְקַיֵּ֡ם אֵת־יְמֵי֩ הַפֻּרִ֨ים הָאֵ֜לֶּה בִּזְמַנֵּיהֶ֗ם כַּאֲשֶׁר֩ קִיַּ֨ם עֲלֵיהֶ֜ם מָרְדֳּכַ֤י הַיְּהוּדִי֙ וְאֶסְתֵּ֣ר הַמַּלְכָּ֔ה וְכַאֲשֶׁ֛ר קִיְּמ֥וּ עַל־נַפְשָׁ֖ם וְעַל־זַרְעָ֑ם דִּבְרֵ֥י הַצֹּמ֖וֹת וְזַעֲקָתָֽם׃
untuk meneguhkan hari-hari Purim itu pada waktu-waktu yang telah ditentukan baginya, sebagaimana telah diwajibkan atas mereka oleh Mordekhai, orang Yahudi itu, dan Ratu Ester, dan sebagaimana mereka telah mewajibkan atas diri mereka sendiri dan atas keturunan mereka hal-hal mengenai puasa-puasa dan ratapan mereka.
Mishneh Torah, Scroll of Esther and Hanukkah
On what date should it be read? The sages prescribed several dates for it, because it is written: "At their appointed times" (Esther 9:31). These are the dates of reading the Megillah: Every town in Eretz Yisrael or abroad that was surrounded by a wall since the time of Joshua the son of Nun should read it on the fifteenth of Adar, even if it has no wall at the present. Such a town is referred to as a walled city. Every town that was not surrounded by a wall in the days of Joshua, even if it has a wall now, should read the Megillah on the fourteenth of Adar. Such a town is referred to as an open city.
Mishneh Torah, Fasts
All the Jewish people are accustomed nowadays to fast on the thirteenth day of Adar in remembrance of the fast observed in the days of Haman, as it is written: "Regarding their fasting and wailing" (Esther 9:31). If the thirteenth of Adar happens to coincide with the Sabbath, we observe the fast earlier, on Thursday, the eleventh. If one of the other four fast days coincides with the Sabbath, it is postponed until after the Sabbath. If it falls on Friday, it is observed on Friday. And in all of these fasts, we do not sound [trumpets] and we do not pray the neilah prayer [service]. But we do read [the section beginning with] "And Moses implored" in the Torah (Exodus 32:11) in the morning service and the afternoon service. And we eat and drink at night on all of them, except for the Ninth of Av.