Esther 9:20

Mordecai wrote these things] This refers not to the existing book of Esther, but to an account contained in the letters sent to effect the purpose indicated in Esther 9:21; Esther 9:22. This was the establishment as yearly festivals for all Jews throughout the empire both the fourteenth and fifteenth days of Adar; and consequently involved a modification of the usage described in Esther 9:17, according to which only a single day (in Susa the fifteenth, in the country districts the fourteenth) was so observed.