'Matter' in the Bible

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.

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,

to establish these days of Purim [to be observed] at their appointed times, just as Mordecai the Jew and Queen Esther had established for them, and as they had established for themselves and for their descendants with instructions regarding their times of fasting and their lamentations (expressions of needing help).