וחמת המלך שככה
“And the fury of the King abated.” (7:10)
Instead of “shachachah” (with two “chafs”) it should have said “shachah”?
The Nachal Eshkol explains: According to the Medrash Rabbah, it was not only Mordechai who intervened on behalf of the Jewish people, but Moshe Rabbeinu too. Thanks to his tefillos the decree against them was nullified. The word “shachachah” with two “chafs” has the numerical value of three hundred and forty-five, the same as the name “Moshe.” With this spelling the Megillah is alluding that the wrath of HaMelech – Hashem, the King - subsided in merit of Moshe.
Alternatively, the Maharsha explains: Achashveirosh never forgave Haman for persuading him to have Vashti executed. In addition, he was angry at Haman for trying to assault Esther while he was out in the palace garden. Now that Haman was hung, the repetition of the letter “chaf” indicates that the twofold anger of the King against him abated.
