Esther 7

8. Haman was fallen upon the bed whereon Esther was--We do not know the precise form of the couches on which the Persians reclined at table. But it is probable that they were not very different from those used by the Greeks and Romans. Haman, perhaps, at first stood up to beg pardon of Esther; but driven in his extremity to resort to an attitude of the most earnest supplication, he fell prostrate on the couch where the queen was recumbent. The king returning that instant was fired at what seemed an outrage on female modesty.
they covered Haman's face--The import of this striking action is, that a criminal is unworthy any longer to look on the face of the king, and hence, when malefactors are consigned to their doom in Persia, the first thing is to cover the face with a veil or napkin.

9. Harbonah, one of the chamberlains, said before the king, Behold also, the gallows--This eunuch had probably been the messenger sent with the invitation to Haman, and on that occasion had seen the gallows. The information he now volunteered, as well it may be from abhorrence of Haman's cold-blooded conspiracy as from sympathy with his amiable mistress, involved with her people in imminent peril.

10. So they hanged Haman on the gallows that he had prepared for Mordecai--He has not been the only plotter of mischief whose feet have been taken in the net which they hid ( Psalms 9:15 ). But never was condemnation more just, and retribution more merited, than the execution of that gigantic criminal.