Esther 9:21
To enjoin them that they should keep the fourteenth day of the month Adar, and the fifteenth day of the same, yearly, demonstrating that Mordecai's letters establish an annual commemoration of the deliverance on these two days. The establishment of an annual commemoration ensures that the memory of the deliverance will not fade and that future generations will be reminded of God's providential care and the reversal of the threat to the Jewish people. The verse shows how historical events of significance are preserved through the establishment of commemorative practices.