Adam Clarke, on Esth 9:31

“And observe the days of lots, and celebrate them with joy in their proper time: as Mardochai and Esther had appointed, and they undertook them to be observed by themselves and by their seed, fasts, and cries, and the days of lots,”

“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.”

Imported from an open dataset — not yet checked against the printed edition.