John Gill Commentary Esther 9:18

"But the Jews that were in Shushan assembled together on the thirteenth [day] thereof, and on the fourteenth thereof; and on the fifteenth [day] of the same they rested, and made it a day of feasting and gladness." — Esther 9:18 (ASV)

But the Jews that were at Shushan assembled together on the
thirteenth day thereof, and on the fourteenth day thereof
Of the month Adar; that is, they gathered together to defend themselves, and destroy their enemies, on both these days, having the decree renewed for the fourteenth as they had for the thirteenth:

and on the fifteenth day of the same they rested, and made it a day of
feasting and gladness ;
as the Jews in the provinces did on the fourteenth.