Esther 8:12

8:12 This was to take place on a certain day throughout all the provinces of King Ahasuerus – namely, on the thirteenth day of the twelfth month (that is, the month of Adar).

Esther 9:17

9:17 All of this happened on the thirteenth day of the month of Adar. They then rested on the fourteenth day and made it a day for banqueting and happiness.