'Fast' in the Bible

Although they fast, I [am] not listening to their cry of entreaty. And although they present burnt offering and grain offering, I [am] not favorable to them. But by the sword, and by the famine, and by the plague, I [am] about to destroy them."

So you must go and you shall read aloud from the scroll that you have written from my mouth the words of Yahweh in the hearing of the people [in] the temple of Yahweh on a day of fast, and also you shall read aloud in the hearing of all those of Judah who came from their towns.

{And then} in the fifth year of Jehoiakim, the son of Josiah, the king of Judah, in the ninth month, all the people in Jerusalem and all the people who came from the towns of Judah to Jerusalem proclaimed a fast {before} Yahweh.