וּבְכָל־מְדִינָ֣ה וּמְדִינָ֗ה מְקוֹם֙ אֲשֶׁ֨ר דְּבַר־הַמֶּ֤לֶךְ וְדָתוֹ֙ מַגִּ֔יעַ אֵ֤בֶל גָּדוֹל֙ לַיְּהוּדִ֔ים וְצ֥וֹם וּבְכִ֖י וּמִסְפֵּ֑ד שַׂ֣ק וָאֵ֔פֶר יֻצַּ֖ע לָֽרַבִּֽים׃
In allen Landschaften, allen Orten, wo der Befehl des Königs und sein Gesetz anlangte, war große Trauer bei den Juden, Fasten und Weinen und Wehklagen; in Sack und Asche legten sich viele.
Rashi
The king’s directives and bylaws. When the couriers carrying the letters passed, the edict was given in the city.
Tze'enah Ure'enah
“Where it reached, there was great mourning among the Jews” [4:3]. The ministers told the secret to some Jews, that in the letter it was written to kill the Jews. The Jews became very mournful and started fasting and repenting. They lay on the earth and in ashes.