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: "When you take a census of the Israelite men according to their army enrollment, each shall pay the Eternal a ransom for himself on being enrolled, that no plague may come upon them through their being enrolled." - Exodus 30:11-12
These are the records of the Tabernacle, the Tabernacle of the Pact, which were drawn up at Moses' bidding--the work of the Levites under the direction of Ithamar son of Aaron the priest. - Exodus 38:21
Moses then convoked the whole Israelite community and said to them: "These are the things that the Eternal has commanded you to do." - Exodus 35:1
The Eternal One called to Moses and spoke to him from the Tent of Meeting, saying: "Speak to the Israelite people and say to them: When any of you presents an offering of cattle to the Eternal: You shall choose your offering from the herd or from the flock." - Leviticus 1:1-2
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