Esther 3:7 ESV

7 In the first month, which is the month of Nisan, in the twelfth year of King Ahasuerus, 1they cast Pur (that is, they cast lots) before Haman day after day; and they cast it month after month till the twelfth month, which is 2the month of Adar.

References for Esther 3:7