'Fast' in the Bible

Go, gather together all the Jews that are present in Shushan, and fast ye for me, and neither eat nor drink three days, night or day: I also and my maidens will fast likewise; and so will I go in unto the king, which is not according to the law: and if I perish, I perish.

On the third day [of the fast] Esther put on her royal robes and stood in the inner court of the king’s palace opposite his [throne] room. The king was sitting on his royal throne, facing the [main] entrance of the palace.

Mordecai wrote in King Ahasuerus’s name and sealed the edicts with the royal signet ring. He sent the documents by mounted couriers, who rode fast horses bred from the royal racing mares.

to establish these days of Purim at their appointed times, just as Mordecai the Jew and Queen Esther had imposed, and just as they had imposed on themselves and their offspring regulations of the fast and their lament.