Esther 2:16

2:16 Then Esther was taken to King Ahasuerus at his royal residence in the tenth month (that is, the month of Tebeth) in the seventh year of his reign.

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).