11. “That the king gave to the Yehudim who were in each city and city to gather, and to stand on their souls, to annihilate, and to kill, and to destroy any army of the nation and state who antagonize them, infants, and women. And their property they should plunder.
According to Dena Pishra, the letters required the Jews to gather because Jewish unity is a powerful method of attaining H-Shem’s assistance.
The Sfas Emes adds that Jews have an aggregate soul, and our combined effort is especially needed when we are in danger.
Furthermore, the Ginzei HaMelech asks that if the word “unify” requires two or more people, and the word “stand” implies one [as one person stands for oneself], which is the letters’ intent? Based on Rashi’s comment on the Talmud (Shabbos 127b) that “stand” means to pray, he answers that the Talmud (Bava Kama 97a) promises a Jew that when one prays for another’s needs, one’s prayers are never rejected. The Talmud (Brachos 8a) says the same idea regarding communal prayer.
16. “Go gather all of the Yehudim found in Shushan and have them fast for me, and not eat, and not drink three days, night and day. Also I and my maidens will fast so. And so I will go to the king, which is not like the law. And as I will be destroyed, I will be destroyed.”
According to Me’am Loez, Esther wanted to bring the Jews together in order to contradict Haman’s slander in Esther 3:5 that the Jews were not unified.
According to Vidibarta Bam, the sale of Yosef is one opinion in the Midrash (Esther Rabbah 7:25) for the Jews’ existence to be threatened. Unity for that prayer would be the correction of this sale.
According to Nachal Eshkol, the gematria of kinos (“gather”) (20+50+6+60= 136) is the same as kol, (“voice”) (100+6+30= 136). The voice is usually symbolic throughout Torah literature of prayer, and thus indicates that Esther also requested that the Jews pray for her, as is indicated in the fact that they did so in Esther 9:31.
Why, in fact, did the verse then not say explicitly that the Jews prayed? As Rav Avigdor Miller points out in Torah Nation, if the authors of Megillas Esther would write that the Jews prayed, they would also have to write to Whom they prayed. However, since Megillas Esther regularly performs mental acrobatics to avoid using H-Shem’s Name, it did not mention the Jews’ praying.
R’ Yechezkiel Levenstein quotes the Midrash (Esther Rabbah 7:19), which writes that after the decree against the Jews, the Torah dressed in widow’s garb, the angels cried, the sun and the moon dimmed, etc. Only the prayer of Mordechai, one man, could overturn the decree. Of course, prayer is powerful, but as the Maharal points out from the Talmud (Brachos 8a), prayer together in a gathering (at least a minyan) is amplified.