'Fasting' in the Bible

Throughout each and every province where the king's edict and law were announced there was considerable mourning among the Jews, along with fasting, weeping, and sorrow. Sackcloth and ashes were characteristic of many.

to establish these days of Purim in their proper times, just as Mordecai the Jew and Queen Esther had established, and just as they had established both for themselves and their descendants, matters pertaining to fasting and lamentation.