To confirm these days of Purim in their times appointed, according as Mordecai the Jew and Esther the queen had enjoined them, and as they had decreed for themselves and for their seed, the matters of the fastings and their cry. As they had decreed for themselves and for their seed - There is no mention of their receiving the approbation of any high priest, nor of any authority beyond that of Mordecai and Esther; the king could not join in such a business, as he had nothing to do with the Jewish religion, that not being the religion of the country.
Related Commentaries of Esther 9:31
Esther 9:31
31 To confirm these days of Purim in their times appointed, according as Mordecai the Jew and Esther the queen had enjoined them, and as they had decreed for themselvesi and for their seed, the matters of the fastings and their cry.