'Fast' in the Bible

and the mariners are afraid, and cry each unto his god, and cast the goods that are in the ship into the sea, to make it light of them; and Jonah hath gone down unto the sides of the vessel, and he lieth down, and is fast asleep.

And the men of Nineveh believe in God, and proclaim a fast, and put on sackcloth, from their greatest even unto their least,