'Fast' in the Bible

Then the mariners were afraid, and cried every man unto his god; and they cast forth the wares that were in the ship into the sea, to lighten it unto them. But Jonah was gone down into the innermost parts of the ship; and he lay, and was fast asleep.

And 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.