Purim is a joyous holiday that affirms and celebrates Jewish survival and continuity throughout history. The main communal celebration involves a public reading—usually in the synagogue—of the Book of Esther (M'gillat Esther), which tells the story of the holiday: Under the rule of King Ahashverosh, Haman, the king's adviser, plots to exterminate all of the Jews of Persia. His plan is foiled by Queen Esther and her cousin Mordechai, who ultimately save the Jews of Persia from destruction. The reading of the m'gillah typically is a rowdy affair, punctuated by booing and noise-making when Haman's name is read aloud.
The Eternal One spoke to Moses, saying: "Command Aaron and his sons thus: This is the ritual of the burnt offering: The burnt offering itself shall remain where it is burned upon the altar all night until morning, while the fire on the altar is kept going on it." - Leviticus 6:1-2
On the eighth day Moses called Aaron and his sons, and the elders of Israel. - Leviticus 9:1
The Eternal One spoke to Moses, saying: "Speak to the Israelite people thus: When a woman at childbirth bears a male, she shall be impure seven days; she shall be impure as at the time of her condition of menstrual separation." - Leviticus 12:1-2
The Eternal One spoke to Moses, saying: "This shall be the ritual for a leper at the time of being purified ." - Leviticus 14:1-2