Baraita
Baraita (Aramaic: "external" or "outside"; pl. "Barayata" or "Baraitot"; also Baraitha, Beraita; Ashkenazi: Beraisa) designates a tradition in the Jewish oral law not incorporated in the Mishnah. "Baraita" thus refers to teachings "outside" of the six orders of the Mishnah. Originally, "Baraita" probably referred to teachings from schools outside the main Mishnaic-era academies – although in later collections, individual "Baraitot" are often authored by sages of the Mishna ("Tannaim"). According to Maimonides ("Introduction to Mishneh Torah"), the baraitot were compiled by Rabbi Hoshaya and Bar Kappara, although no compilation was passed down to us as the Tosefta was. Because  the Mishnah encapsulates the entire Oral Law in a purposely compact form (designed to both facilitate "and" necessitate oral transmission), many variant versions, additional explanations, clarifications and rulings were not included in the Mishnah. These were later compiled in works called the ""Baraitot"" – often in the form of a list of teachings by one sage. "Baraita" can thus also designate collections of such traditions. The main collections of "Baraita" are the Tosefta and the Halakhic Midrashim (Mekhilta, Sifra and Sifre). The authority of the "Baraita" is somewhat less than that of the Mishnah. Nevertheless, these works are the basic "proof -text" cross-referenced by the Talmudic sages in their analysis and interpretation of the Mishna; see Gemara. Here, a teaching from the "Baraita" is usually introduced by the Aramaic word ""Tanya"" ("It was orally taught") or by ""Tanu Rabanan"" (""Our Rabbis" have orally taught"), whereas ""Tnan"" (""We" have orally taught") introduces quotations from the Mishnah. Anonymous "Baraitot" are often attributed to particular "Tannaim" by the Talmud. In the Jerusalem Talmud, references to "Baraitot" are less common. The style of the "Baraita" is basically indistinguishable from that of the Mishna, but some come closer to Mishnaic idiom than others. For example , the second chapter of "Kallah Rabbathi", a "beraita" compilation, is often appended to Pirkei Avoth, as both are similar in style and content.