'Fast' in the Bible

Then the mariners were afraid, and every man cried to his god. They threw the cargo that was in the ship into the sea to lighten the ship. But Jonah had gone down into the innermost parts of the ship, and he was laying down, and was fast asleep.

The people of Nineveh believed God; and they proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them.