וְקִבֵּל֙ הַיְּהוּדִ֔ים אֵ֥ת אֲשֶׁר־הֵחֵ֖לּוּ לַעֲשׂ֑וֹת וְאֵ֛ת אֲשֶׁר־כָּתַ֥ב מָרְדֳּכַ֖י אֲלֵיהֶֽם׃
And the Jews took upon them to do as they had begun, and as Mordecai had written unto them;
Read halakhic rulings (Jewish law) on Esther 9:23: and classical halakhic sources.