Matthew Poole and continuators on Esther 8:17

17 And in every province, and in every city, whithersoever the kings commandment and his decree came, the Jews had joy and gladness, a feast and a good day ▪ and many of the people of the land became Jews; for the fear of the Jews fell upon them.

i. e. A time of feasting, and rejoicing, and thanksgiving.

Whom possibly they had irritated by their former threatnings, and now gave this evidence of their Repentance, that they were willing to submit to that severe precept of Circumcision.