Esther 9:31-32

Amplified Bible, Classic Edition

³¹ To confirm that these days of Purim should be observed at their appointed times, as Mordecai the Jew and Queen Esther had commanded [the Jews], and as they had ordained for themselves and for their descendants in the matter of their fasts and their lamenting.

³² And the command of Esther confirmed these observances of Purim, and it was written in the book.