In the twelfth year of the reign of King Ahasuerus, in the first month (the month Nisan), the (that is, the lot) was cast in Haman's presence to determine the best day and month to carry out his plot. The lot indicated the twelfth month, the month Adar.

since Hammedatha's son Haman, the enemy of the Jewish people, had plotted against the Jewish people to destroy them, and he had cast the (that is, the lot) to determine when to confuse and destroy them.

therefore they have called these days Purim -- by the name of the lot -- therefore, because of all the words of this letter, and what they have seen concerning this, and what hath come unto them,