The Fast of Esther

9. Ta’anit Esther

Chapter 14: The Month of Adar

The custom of all Jewry, since the geonic period, is to fast on the thirteenth of Adar in commemoration of the fasts that Esther observed before approaching King Aĥashverosh to annul the decree against the Jewish peopleand the fast that the Jews observed on the thirteenth of Adar of that year.