Esther 9:24-26

24They remembered what Hammedatha's son, Haman, the descendant of Agag, had done. He had been the enemy of the Jews and he had tried to destroy them all. He had thrown dice, called Purim, to choose the day when he would attack them and kill them.

25But Esther went to tell the king what Haman was doing. Then the king stopped the evil thing that Haman wanted to do against the Jews. The king wrote a command to say that Haman should die. The same thing that Haman wanted to do to the Jews should happen to him instead. The bodies of Haman and his sons hung on the wooden tower that his men had built.

26So the Jews call the days of their feast ‘Purim’. That was the name of the dice that Haman used. They did this because of what Mordecai wrote in his letter. They wanted to remember everything that had happened to them.