John Gill, on Esth 9:11

Then said Esther, if it please the king,.... For she was all submission to his will: let it be granted to the Jews which are in Shushan; for no further did she desire the grant to be extended: to do tomorrow also according to this days decree; one Targum makes the request only that they might keep the morrow as a festival, but the other, more rightly, to do according to the decree of this day; which was, to slay as many of their enemies as rose up against them; and whereas many might flee and hide themselves, who were implacable enemies of the Jews, Esther moves for a grant that the decree might be continued for the next day, that these might be found out and slain; in which she sought the glory of divine justice, in their righteous destruction, and the peace of the people of God, and not private revenge, or to indulge malice: and let Haman's ten sons be hanged upon the gallows; on which their father was; this was deferred, though they were already slain, for their greater reproach, and for a terror to others not to injure the people of God; and it was usual with the Persians to hang persons on a gallows, or fix them to a cross, after they were dead; as Polycrates was by Oroites (i), and Bagspates by Parysatis (k). (i) Herodot. Thalia, sive, l. 3. c. 125. (k) Ctesias in Persicis, c. 58.