Esther 9:29

Therefore they called these days “Purim”, from the word “Pur.” Therefore because of all the words of this letter, and of that which they had seen concerning this matter, and that which had come to them,

the Jews established and imposed on themselves, on their descendants, and on all those who joined themselves to them, so that it should not fail that they would keep these two days according to what was written and according to its appointed time every year;

and that these days should be remembered and kept throughout every generation, every family, every province, and every city; and that these days of Purim should not fail from among the Jews, nor their memory perish from their offspring.

He sent letters to all the Jews in the hundred twenty-seven provinces of the kingdom of Ahasuerus with words of peace and truth,

to confirm these days of Purim in their appointed times, as Mordecai the Jew and Esther the queen had decreed, and as they had imposed upon themselves and their descendants in the matter of the fastings and their mourning.

The commandment of Esther confirmed these matters of Purim; and it was written in the book.