Esth 9:23

“But when Esther came before the king,.... To request of him her life, and the life of her people: he commanded by letters, that his wicked device, which he devised against the Jews, should return upon his own head; that whereas his wicked scheme was to destroy all the Jews, the king, by his second letter, gave orders that the Jews should have liberty to defend themselves, and destroy their enemies which rose up against them; and the friends and party of Haman were entirely cut off: and that he and his sons should be hanged on the gallows; which he had prepared for Mordecai; not that they were ordered to be hanged together, nor were they; Haman was hanged before on the twenty third day of the month, but his sons not till the fourteenth day of the twelfth month; Est 7:10.”

“The Jews undertook to do as they had begun - They had already kept the fifteenth day, and some of them in the country the fourteenth also, as a day of rejoicing: Mordecai wrote to them to bind themselves and their successors, and all their proselytes, to celebrate this as an annual feast throughout all their generations; and this they undertook to do. And it has been observed among them, in all places of their dispersion, from that day to the present time, without any interruption.”

“And the Jews undertook to do as they had begun, and as Mordochai had written to them. They had begun, as Est 9:22 tells us, by keeping both days, and Mordochai wrote to them that they should make this an annual custom. This they agreed to do in consequence of Mordochai's letters. The reason of their so doing is given in Est 9:24 and Est 9:25, and the name of this festival is explained, Est 9:26, by a brief recapitulation of the events which gave rise to it. Then follows, Est 9:26 and Est 9:27, another wordy statement of the fact, that it was by reason of this letter, and on account of what they had seen, i.e., experienced, that the annual celebration of this feast was instituted for a perpetual memorial to all Jews at all times (Est 9:28 and Est 9:29).”