Esther 9:21

21 enjoining them that they should keep the fourteenth day of the month Adar and also the fifteenth day of the same month, year by year,

Esther 9:21 In-Context

19 Therefore the Jews of the villages, who live in the open towns, hold the fourteenth day of the month of Adar as a day for gladness and feasting, a holiday on which they send gifts of food to one another.
20 Mordecai recorded these things, and sent letters to all the Jews who were in all the provinces of King Ahasuerus, both near and far,
21 enjoining them that they should keep the fourteenth day of the month Adar and also the fifteenth day of the same month, year by year,
22 as the days on which the Jews gained relief from their enemies, and as the month that had been turned for them from sorrow into gladness and from mourning into a holiday; that they should make them days of feasting and gladness, days for sending gifts of food to one another and presents to the poor.
23 So the Jews adopted as a custom what they had begun to do, as Mordecai had written to them.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.