- According to most opinions, including Rashi, Ibn Ezra, Lekach Tov, M’nos HaLevi, R’ Moshe Dovid Valle, and the Vilna Gaon, “the ones who join” are future converts.
- R’ Chaim Kanievsky wonders why Purim is different from other mitzvos that converts need to be mentioned specifically regarding Purim’s celebration. He answers that, even though converts were not party to the miraculous rescue, one’s descendants should be obligated to recite a Thanksgiving Blessing for one’s rescue, as they were affected by it, as well. This is similar to a student showing gratitude for the rescue of his rebbe. Had it not been for the rebbe’s being rescued, the student would not have had access to the World to Come. For this reason, although converts did not experience the miracle of the first Purim, their new people’s having gone through it is reason enough for them to accept the mitzva of celebrating the holiday.
- According to the Ateres Moshe, converts are mentioned here to mirror Moshe’s statement (Devorim 29:14) that the acceptance of the Torah applies equally to those who were there and even those not there.
- In the view of the Midrash Shmuel, converts are not always sincere about their reason for joining the Jewish people. Those who converted in Persia (Esther 8:17), for instance, may have done so in order to save their lives. However, in commemoration of the Persians who converted sincerely then, Purim was accepted as a way to celebrate future sincere converts, as well.
- The Maharal adds that a convert can’t ignore even one rabbinic law, and rabbinic law is a motif throughout Megillas Esther.
- The Ksav Sofer writes that the sorrow to which the verse refers was the sadness felt for Moshe’s death (Adar 7). This is because people at the time feared that the Torah would be forgotten. This is what the Talmud (Bava Basra 75b) implies by quoting the leaders of the time as saying, “Woe onto us that Moshe’s face is like the sun, and Yehoshua’s is like the moon!” They were, however, incorrect in their estimations, as Yehoshua proved to be a faithful conductor of Moshe’s teaching, as testified to in the Mishna (Avos 1:1).
- Furthermore, the Jews’ re-acceptance of the Torah on Purim, as seen from the words kimu v’kiblu (“they established and accepted”) (Esther 9:27) demonstrates that the Torah of Moshe did not die (chas v’Shalom) with him.
- Furthermore, the Maharal opines that since Adar is the end of the annual cycle of months, Adar would spell the end of the Jews.
יז וּבְכָל–מְדִינָה וּמְדִינָה וּבְכָל–עִיר וָעִיר מְקוֹם אֲשֶׁר דְּבַר–הַמֶּלֶךְ וְדָתוֹ מַגִּיעַ שִׂמְחָה וְשָׂשׂוֹן לַיְּהוּדִים מִשְׁתֶּה וְיוֹם טוֹב וְרַבִּים מֵֽעַמֵּי הָאָרֶץ מִתְיַהֲדִים כִּי–נָפַל פַּחַד–הַיְּהוּדִים עֲלֵיהֶם
17. And in each every state, and in each and every city – any place where the word of the king and his law was revealed – there was happiness and joy to the Yehudim, a feast and holiday. And many from the nations of the land became Yehudim because the fear of the Yehudim fell upon them.
The Ksav Sofer points out that the repetition of “happiness and joy” in this verse connotes the high degree of happiness present on Purim due to re-acceptance of Torah (Esther 9:27).
R’ Moshe Dovid Valle notes that these four expressions of happiness are intended to stand in marked contrast to the four expressions of sadness (Esther 4:3) – evel (“mourning”), tzom (“fasting”), bechi (“crying”), and misped (“eulogy”) – used earlier when knowledge of Haman’s decree became known.
The Ben Ish Chai points out that, taken together, the first letters of the words magiya simcha v’sasson la’Yehudim (“there was happiness and joy to the Yehudim”) form a rearranged acronym for shalom (“peace”). This is because joy and happiness is only fully realized in peace.