עַל־כֵּ֡ן קָֽרְאוּ֩ לַיָּמִ֨ים הָאֵ֤לֶּה פוּרִים֙ עַל־שֵׁ֣ם הַפּ֔וּר עַל־כֵּ֕ן עַל־כָּל־דִּבְרֵ֖י הָאִגֶּ֣רֶת הַזֹּ֑את וּמָֽה־רָא֣וּ עַל־כָּ֔כָה וּמָ֥ה הִגִּ֖יעַ אֲלֵיהֶֽם׃
Посему и назвали в эти дни Пурим по имени пур. Поэтому из-за всех слов этого письма и из того, что они видели относительно этого вопроса, и из того, что пришло к ним,
Rashi
For this reason ... because of all that is narrated in this letter. These days were designated, and therefore it [the Megillah] was written for the future generations to know.
Rashi
Why they saw fit. Those who did these deeds, that they did them.
Rashi
And what happened to them as a result. What did Achashveirosh see that he used the sacred vessels, “and what happened to them as a result,” that Satan came and danced among them and slew Vashti. What did Haman see that he became jealous of Mordechai, “and what happened to him as a result,” that they hanged him and his sons. What did Mordechai see that he did not kneel or prostate himself, and what did Esther see that she invited Haman?8Maseches Megillah 19a.