John Gill Commentary Esther 3:14

"A copy of the writing, that the decree should be given out in every province, was published unto all the peoples, that they should be ready against that day." — Esther 3:14 (ASV)

The copy of the writing, for a commandment to be given in
every province, was published unto all people
Not only letters were sent to the governors, but a copy, or the sum of the contents of them, was published by heralds, or stuck up as with us, in various places, that it might be publicly known by the common people everywhere:

that they should be ready against that day ;
and fall upon the people of the Jews, and slay them, and seize on their goods as a prey.