While the main theme of the book of Esther is the deliverance of the Jewish people in Persia from destruction, the end result is the celebration of the feast of Purim. These verses outline a five-step process by which the deliverance of the Jews came to remember the festival annually:
(1) the letter of Mordecai instructing the Jews that the festival should be held on the fourteenth and fifteenth of Adar (9:20-22);
(2) the Jews agreeing to continue the celebration they had begun (9:23-25);
(3) the naming of the feast (9:26a);
(4) remembering the feast would happen once each year (9:26b-28); and
(5) a second confirming letter was sent by Queen Esther and Mordecai the Jew (9:29-32).