'Fast' in the Bible

Why then is this people of Jerusalem slidden back by a perpetual backsliding? they hold fast deceit, they refuse to return.

When they fast, I will not hear their cry; and when they offer burnt offering and meal offering, I will not accept them; but I will consume them by the sword, and by the famine, and by the pestilence.

therefore you go, and read in the scroll, which you have written from my mouth, the words of Yahweh in the ears of the people in Yahweh's house on the fast day; and also you shall read them in the ears of all Judah who come out of their cities.

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

The calamity of Moab is near to come, and his affliction hurries fast.

Thus says Yahweh of Armies: The children of Israel and the children of Judah are oppressed together; and all who took them captive hold them fast; they refuse to let them go.