Esther 9:22 (KJV)

And Mordecai wrote these things, and sent letters unto all the Jews that were in all the provinces of the king Ahasuerus, both nigh and far,

To stablish this among them, that they should keep the fourteenth day of the month Adar, and the fifteenth day of the same, yearly,

As the days wherein the Jews rested from their enemies, and the month which was turned unto them from sorrow to joy, and from mourning into a good day: that they should make them days of feasting and joy, and of sending portions one to another, and gifts to the poor.

And the Jews undertook to do as they had begun, and as Mordecai had written unto them;

Because Haman the son of Hammedatha, the Agagite, the enemy of all the Jews, had devised against the Jews to destroy them, and had cast Pur, that is, the lot, to consume them, and to destroy them;