 The key Purim-related liberating wartime events and main mention of the month appear in the holy scripture of Esther 9, its last book.In leap years, it is preceded by a 30-day intercalary month named Adar Aleph (, Aleph being the first letter of the Hebrew alphabet, also known as "Adar Rishon" ("First Adar") or "Adar I") and it is then itself called Adar Bet (, Bet being the second letter of the Hebrew Alphabet, also known as "Adar Sheni" ("Second Adar") or "Adar II").Occasionally instead of Adar I and Adar II, "Adar" and "Ve'Adar" are used (Ve means 'and' thus