Adam Clarke, on Esth 9:15

“And on the fourteenth day of the month Adar the Jews gathered themselves together, and they killed in Susan three hundred men: but they took not their substance.”

“And slew three hundred men - Esther had probably been informed by Mordecai that there were still many enemies of the Jews who sought their destruction, who had escaped the preceding day; and, therefore, begs that this second day be added to the former permission. This being accordingly granted, they found three hundred more, in all eight hundred. And thus Susa was purged of all their enemies.”

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