John Gill Commentary Esther 8:13

"A copy of the writing, that the decree should be given out in every province, was published unto all the peoples, and that the Jews should be ready against that day to avenge themselves on their enemies." — Esther 8:13 (ASV)

The copy of the writing, for a commandment to be given in
every province, was published to all people
A copy of the letters sent to the governors of provinces; the sum and substance of them was published by an herald, or fixed in public places, that all might know the contents thereof; and take care not to assault the Jews, as it would be to their peril:

and that the Jews should be ready against that day to avenge themselves
on their enemies ;
Abendana thinks this is to be restrained to those that were of the seed of Amalek, who were their principal enemies; but no doubt it includes all that should rise up against them.