Matthew Poole and continuators on Esther 9:6

6 And in Shushan the palace the Jews slew and destroyed five hundred men .

i. e. In the City so called, as was noted before ch. 1. 2. it not being probable either that they would make such a slaughter in the Kings palace, or that they would be suffered so to do.

Whom by long experience they knew to be their constant and inveterate Enemies, and such as would watch all opportunities to destroy them; which also they might possibly now attempt to do. Part of them also might be Friends and Allies of Haman, and therefore the avowed Enemies of Mordecai.