Esther 8:17

8:17 Throughout every province and throughout every city where the king’s edict and his law arrived, the Jews experienced happiness and joy, banquets and holidays. Many of the resident peoples pretended to be Jews, because the fear of the Jews had overcome them.

Esther 9:27

9:27 Therefore, because of the account found in this letter and what they had faced in this regard and what had happened to them, the Jews established as binding on themselves, their descendants, and all who joined their company that they should observe these two days without fail, just as written and at the appropriate time on an annual basis.