Hagigah in the context of "Tumah and taharah"

Shimon bar Yochai (Zoharic Aramaic: שמעון בר יוחאי, Šimʿon bar Yoḥay) or Shimon ben Yochai (Mishnaic Hebrew: שמעון בן יוחאי), also known by the acronym Rashbi, was a 2nd-century tanna or sage of the period of Roman Judaea and early Syria Palaestina. He was one of the most eminent disciples of Rabbi Akiva. The Zohar, a 13th-century foundational work of Kabbalah, is ascribed to him by Kabbalistic tradition, but this claim is universally rejected by modern scholars.

In addition, the essential legal works called the Sifre and Mekhilta of Rabbi Shimon ben Yochai are attributed to him (not to be confused with the Mekhilta of Rabbi Ishmael, of which much of the text is the same). In the Mishnah, where he is the fourth-most mentioned sage, he is referred to as simply "Rabbi Shimon" except in Hagigah 1:7. In baraitas, midrash, and gemara, his name occurs either as Shimon or as Shimon ben Yochai. An 8th-century pseudonymous attribution of divine revelations to Shimon by the angel Metatron is also known, called The Secrets of Rabbi Simon ben Yohai.

Moed (Hebrew: מועד, 'Festivals') is the second Order of the Mishnah, the first written recording of the Oral Torah of the Jewish people (also the Tosefta and Talmud). Of the six orders of the Mishna, Moed is the third shortest. The order of Moed consists of 12 tractates:

1. Shabbat or Shabbath (שבת‎) ("Sabbath") deals with the 39 prohibitions of "work" on the Shabbat. 24 chapters.
2. Eruvin (ערובין) ("Mixtures") deals with the Eruv or Sabbath-bound - a category of constructions/delineations that alter the domains of the Sabbath for carrying and travel. 10 chapters.
3. Pesahim (פסחים) ("Passover Festivals") deals with the prescriptions regarding the Passover and the paschal sacrifice. 10 chapters.
4. Shekalim (שקלים) ("Shekels") deals with the collection of the half-Shekel as well as the expenses and expenditure of the Temple. 8 chapters
5. Yoma (יומא) ("The Day")—also called "Kippurim" or "Yom ha-Kippurim" ("Day of Atonement")—deals with the prescriptions Yom Kippur, especially the ceremony by the Kohen Gadol. 8 chapters.
6. Sukkah (סוכה) ("Booth") deals with the festival of Sukkot (the Feast of Tabernacles) and the Sukkah itself. Also deals with the Four Species (Lulav, Etrog, Hadass, Aravah — Palm branch, Citron, Myrtle, Willow) which are waved on Sukkot. 5 chapters.
7. Beitza (ביצה) ("Egg")—now named after its first word, but originally called Yom Tov ("Holidays")—deals chiefly with the rules to be observed on Yom Tov. 5 chapters.
8. Rosh Hashanah (ראש השנה) ("New Year") deals chiefly with the regulation of the calendar by the new moon, and with the services of the festival of Rosh Hashanah. 4 chapters.
9. Ta'anit (תענית) ("Fasting") deals chiefly with the special fast-days in times of drought or other untoward occurrences. 4 chapters
10. Megillah (מגילה) ("Scroll") contains chiefly regulations and prescriptions regarding the reading of the scroll of Esther at Purim, and the reading of other passages from the Torah and Neviim in the synagogue. 4 chapters.
11. Mo'ed Katan (מועד קטן) ("Little Festival") deals with Chol HaMoed, the intermediate festival days of Pesach and Sukkot. 3 chapters.
12. Hagigah (חגיגה) ("Festival Offering") deals with the Three Pilgrimage Festivals (Passover, Shavuot, Sukkot) and the pilgrimage offering that men were supposed to bring in Jerusalem. 3 chapters.

The Jerusalem Talmud has a Gemara on each of the tractates, while in the Babylonian, only that on Shekalim is missing. However, in most printed editions of the Babylonian Talmud (as well as the Daf Yomi cycle), the Jerusalem Gemara to Shekalim is included.