'Fasts' in the Bible

to establish these days of Purim [to be observed] at their appointed times, just as Mordecai the Jew and Queen Esther had established for them, and as they had established for themselves and for their descendants with instructions regarding their times of fasting and their lamentations (expressions of needing help).

"This is what the LORD of the Heavenly Armies says: "The fasts that occur in the fourth, fifth, seventh, and tenth months will be joyful and glad times for the house of Judah, replete with cheerful festivals. Therefore, love truth and peace.'"

and she is a widow of about eighty-four years, who did depart not from the temple, with fasts and supplications serving, night and day,