They cast — The diviners cast lots, according to the custom of those people, what day, and what month would be most lucky, not for his success with the king (of which he made no doubt) but for the most effectual extirpation of the Jews. Wherein appears likewise both his implacable malice, and unwearied diligence in seeking vengeance of them with so much trouble to himself; and God's singular providence in disposing the lot to that time, that the Jews might have space to get the decree reversed.
Related Commentaries of Esther 3:7
Esther 3:7
7 In the first month, that is, the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month, that is, the month Adar.