Esther 4:3; Esther 4:16

3 There was great mourning among the Jewish people in every province where the king's command and edict came. They fasted, wept, and lamented, and many lay on sackcloth and ashes.

16 "Go and assemble all the Jews who can be found in Susa and fast for me. Don't eat or drink for three days, night and day. I and my female servants will also fast in the same way. After that, I will go to the king even if it is against the law. If I perish, I perish."