'Matters' in the Bible

Mordecai wrote these matters down and sent letters to all the Jews who were throughout all the provinces of King Ahasuerus, both near and far,

to establish these days of Purim in their proper times, just as Mordecai the Jew and Queen Esther had established, and just as they had established both for themselves and their descendants, matters pertaining to fasting and lamentation.

Esther's command established these matters of Purim, and the matter was officially recorded.