'First' in the Bible

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.

The king's scribes were summoned on the thirteenth day of the first month, and all that Haman commanded was written to the regional authorities of the king, to the governors who were over each province, and to the officials of each people. This order was translated in the name of King Ahasuerus into the language of each province and bore the seal of the king's signet ring.