It seems problematic that Achashverosh gave Haman’s property to Esther since the Mechilta (on Shemos 17:14) says Amalek – of which Haman descended – is to be completely destroyed together with its property, so nobody should ever say they gained from Amalek.
Esther may have been allowed Haman’s property because the Rabbeinu Bachya (on Bishalach) answers that this Mechilta only refers to possessions obtained in the course of war.
In Vedibarta Bam, Rabbi Bogamilsky points out from the Talmud (Sanhedrin 48b) that such property actually belongs to Achashverosh.
Similarly, the Talmud (Gittin 38a) teaches that the Jews were allowed the possessions of Moav and Amon because Sichon had already conquered them previously.
Given that Esther was allowed Haman’s property, the Alshich writes that Achashverosh gave it to her because the kingdom did not need Haman’s house, after all. This is especially true if Haman destroyed his own home by utilizing its crossbeam in the building of his gallows.
The Alshich adds that the decree to kill out the Jews had not yet been revoked, and Achashverosh wanted to show that Esther and Mordechai were exempt.
On the other hand, the Yad HaMelech says that the king did this so that those who knew of the decree would not harm the Jews, effectively annulling the decree.
The M’nos HaLevi explains that Achashverosh gave her the property to reassure Esther, that although she had seen him angry that day, the anger was not directed at her.
The Malbim writes that this was Haman’s property, which should belong to Achashverosh after his rebellious behavior. However, in a continued effort to salvage his honor, Achashverosh wanted to show that Haman was really going against the queen and her people. Accordingly, the verse emphasizes that Haman was the tzorer (“antagonizer”) of the Yehudim.
The Ginzei HaMelech explains that Achashverosh’s main concern was his security, especially around Haman’s presumed allies. He therefore said Haman tried to seduce the queen, and therefore owed her money. A similar incident occurred when Avimelech took Sarah, and then gave Avraham money (Bireishis 20:14) as a testament of Sarah’s virtue.
The Vilna Gaon quotes a verse (Koheles 2:26) that a person who deserves H-Shem’s Pleasure receives wisdom, intelligent, and joy, but a sinner must constantly accumulate. The Talmud (Megillah 10b) says that this verse applies to Mordechai because the wicked Haman accrued the very wealth through which the righteous prospered.
The Maharal asks why the righteous should prosper from the efforts of the wicked. After all, should the righteous not prosper from their own efforts? He answers that the wicked work and work tirelessly to gain more wealth because they are never satisfied. The righteous are easily satisfied, so they do not have to go through the grunt work of acquiring wealth.
R’ Dovid Feinstein explains this as yet another example of mida kineged mida “measure for measure” because Haman wanted to take what was most precious to Esther – the lives of her people. Therefore, he lost what was most precious to him – his money.
The Me’am Loez says that another example of mida kineged mida is that since Haman wanted to hang Mordechai in his house, Haman’s hanging occurred in what is now Mordechai’s house.
Rebbetzin Tzipporah Heller adds that Achashverosh took the property because Haman was Mordechai’s slave. According to Jewish law, the property always really belonged to Haman’s master, Mordechai. With the property comes Haman’s identity. She suggests that taking over someone’s identity is another reason for the custom to masquerade on Purim.
Rashi’s simple explanation is that Mordechai thinks Esther believes she will be safe in the palace on the day of the massacre. Rabbi Avigdor Bonchek, however, sees in Rashi’s words an irony that Esther’s safety can only be guaranteed through self-sacrifice.
The Vilna Gaon writes that Mordechai thought that Esther was under the impression that her volunteering herself to Achashverosh was one of the carnal sins for which one should sacrifice one’s life rather than sin, even for the sake of others.
The Sfas Emes points out that the Halacha (Shulchan Aruch, Yoreh Deah 157:1) requires a city under siege to refuse to give up any resident requested for execution by the attacking army. This is the case if this oppressive army does not specify their victim. However, if they they want a specific person, the community must give that person up to save themselves, since that person is threatened either way. This is only true when that person is threatened along with everyone else. Mordechai thinks Esther considers herself to be in this latter situation, safely tucked away in the palace.
R’ Dovid Feinstein writes that Mordechai was saying that H-Shem will save His people, as He always does. However, if Esther acts selfishly, she will not be among the other Jews.
Similarly, due to the fact that Mordechai mentions the king’s palace, and every mention of the word “king” is a reference to H-Shem, R’ Dovid Moshe Valle adds that the King can reach anywhere.
R’ Elisha Gallico notes that, in fact, Esther was actually in more danger staying in the palace. The reason for this, explains the Maharal, is that considering Achashverosh’s virulent hate for the Jews, Esther is safer away from the man who signed the edict to annihilate her nation. The Maharal compares this to living inside a basket with a snake. This is even moreso the case if Esther thinks of herself as an individual, and thus lacking the power of the united nation.
The Alshich says that, in Mordechai’s estimation, the root of Esther’s mission was to fix King Shaul’s error of allowing Agag to live.
According to Ginzei HaMelech, this is the reason why Mordechai is giving Esther such strong rebuke here; Esther needs to know that the only reason she was in that position was for this goal. Furthermore, Ginzei HaMelech points out that Torah is honest. Here, since Megillas Esther was written by Esther, herself, she nevertheless did not censor out this scene in which she looks weak. The Ginzei HaMelech furthermore adds that this case it was not appropriate to stay private.
R’ Menachem Ziemba was asked before the Warsaw ghetto uprising if the Chassidim should be involved in the fighting. He answered that it is indeed a mitzvah to give up one’s life when given the choice between death or their faith. When given no such choice, it is a mitzvah to fight.
According to the Kisei Shlomo, Mordechai was telling Esther she was responsible for Hasach’s death, and thus more invested now in the rescue of the Jews.
Rav Yitzchak Hutner writes in Pachad Ytizchak that when Person A needs something, and decides to also pray for Person B who also needs that, this makes Person A’s prayer more effective (Talmud, Baba Kama 92a). Rav Hutner explains that this principle works because prayer is stronger if it is performed with the whole heart (Talmud, Sotah 5b), meaning that it is more strongly felt. Therefore, Mordechai is telling Esther that she needs the same rescue as the Jews. In other words, she was already intent on praying for the Jews; what Mordechai wanted Esther to realize was that she was in the same precarious situation. Realizing that she also needs H-Shem to rescue her would cause Esther to feel that prayer with her whole heart, making her prayer stronger, and thus more effective.