Esther 9:25-27

Amplified Bible

²⁵ But when it came before the king, he commanded in writing that Haman’s wicked scheme which he had devised against the Jews was to return on his own head, and that he and his sons should [endure what he planned for the Jews and] be hanged on the gallows. ²⁶ Therefore they called these days Purim after the name Pur (lot). And because of all the instructions in this letter, and what they had faced in this regard and what had happened to them, ²⁷ the Jews established and made it a custom for themselves and for their descendants and for all who joined them, so that they would not fail to celebrate these two days as it was written and at the appointed time annually.