'Fast' in the Bible

When the congregation of the synagogue had been dismissed, many of the Jews and the devout converts to Judaism followed Paul and Barnabas, who, talking to them were urging them to continue in the grace of God.

Now much time had been lost, and navigation was dangerous, because even [the time for] the fast (Day of Atonement) was already over, so Paul began to strongly warn them,

But striking a reef with waves breaking in on either side, they ran the ship aground. The prow (forward point) stuck fast and remained immovable, while the stern began to break up under the [violent] force of the waves.