Purim is so-called because of Yom HaKipurim [the Day of Atonement. But literally, "the day like ( =k’) Purim"] because in the future we will delight in that day [the Day of Atonement] and transform it from [a day of] affliction to [a day of] delight [just like Purim]… And just as on that day he [the High Priest] adorns himself with the garments of atonement [the four white garments signifying the aspect of chesed] so too, regarding Esther it is written, "and she donned her royal garb" (Esther 5:1). Just as with these [white garments, the High Priest] enters the innermost sanctuary [where he attains atonement for the Jewish People], so too, "[Esther] stood in the inner courtyard of the king" (ibid.) [dressed in her royal garb] and "she found favor in his eyes."

Now, what caused the Shechinah [the Divine Presence] to become afflicted with exile

[Just as the Jewish People were exiled from the Holy Land after the Temple was destroyed, so too, the Shechinah was exiled from its place in the Temple, as the verse states, "They shall make for Me a Temple, and I will dwell among them"? (Ex. 25:8)]
The secret of the matter is [alluded to in the following, a verse in the Megillah]: "So I shall come before the king though it is against the law" (Esther 4:16) because she came without her husband
[The intention here is that the Shechinah, regarded as a "female" and gevurah element since it is associated with the sefira of malchut, appears without the "male" counterpart – Zeir Anpin.]
regarding whom it states, "from His right hand [signifying chesed] comes a fiery law" [i.e. Torah] (Deut. 33:2) for they abandoned the Torah and this caused the destruction of the First and Second Temples, as the verse states, "And if I perish, I perish!" (Esther 4:16). [Since the verse states "perish" twice, this is understood to allude to two destructions – hence the destruction of both Temples].

Nevertheless, even though she entered without her husband, i.e. the words of Torah, she still entered with [the merit of the three] Patriarchs [alluded to in the words, "Do not eat or drink]for three days, night or day" (ibid.) during which she [also] fasted. They were witnesses that the maiden went into the king, as the verse states, "And with this the maiden went in to the king" (ibid. 2:13). She who went in to the king indeed remained a maiden, for no man knew her other than her husband.

[The implication here is two-fold: a) Esther was a virgin when she went in to king Achashverosh and remained so (as we will explain in footnote 3), for no other man touched her than Mordechai. b) The Jewish People also remained untouched by any other faith. For although "they abandoned the Torah," as mentioned above, the Talmud (Bava Metiza 85b) explains that this means that they did not appreciate it sufficiently (Rashi), or that they did not cleave to He who gave them the Torah (Maharal, Tiferet Yisrael, Intro.) not that they completely abandoned it.]
…Regarding this it is written, "He reared Hadassah (Esther’s other name)faithfully…" (Esther 2:7) and he [Mordechai] was faithful to her, and she was faithful to him, and this is what the verse states, "For Esther was faithful to Mordechai, just as he had faithfully reared her" (ibid. 2:20)

[From Tikkunei Zohar, Tikkun 21 p. 57b.
Translated with commentary by Rabbi Moshe Miller]