'Fast' in the Bible

“Why then has this people of JerusalemTurned away with a perpetual turning away [from Me]?They hold tightly to deceit (idolatry);They refuse to repent and return [to God].

Though they fast, I will not hear their cry; and though they offer burnt offerings and grain offerings, I will not accept them [because they are done as obligations, and not as acts of loving obedience]. Instead I will consume them by the sword, by famine, and by pestilence.”

Now in the fifth year of Jehoiakim the son of Josiah, king of Judah, in the ninth month, a fast was proclaimed before the Lord for all the people in Jerusalem and all the people who came to Jerusalem from the cities of Judah.

Thus says the Lord of hosts,“The children of Israel are oppressed,And the children of Judah as well;And all who took them captive have held them tightly,They have refused to let them go.