text · B0007

Tosefta תוספתא

The Mishnah's companion corpus — the organized collection of tannaitic teachings left out of Rabbi Yehudah HaNasi's canon. For the atlas it shows the mesorah's habit of preserving the excluded material rather than discarding it: the baraitot here feed both Talmuds' discussions.

I. Who

Hebrew: תוספתא
Era: tannaim

II. When

Traditional: compiled in the generation after the Mishnah, c. 3990 AM (c. 230 CE)
Academic: 3rd c. CE; relationship to the Mishnah's redaction debated
Duration: ≈20 years
Precision: approximate

IV. What

Language: Mishnaic Hebrew
Redaction: Anonymous core attributed to R' Nechemiah (Sanhedrin 86a); compilation traditionally credited to R' Chiya (with R' Oshaya), the students of Rabbi Yehudah HaNasi (Rabbi Yehudah HaNasi), whose academies' baraitot the Talmud treats as uniquely reliable.
Structure: Follows the Mishnah's (B0003) six orders and nearly all its tractates, at roughly three times the length, mixing parallel rulings, supplements, and material the Mishnah omitted.

V. How do we know

Claim	Evidence	Confidence	Sources
"The anonymous Tosefta is R' Nechemiah... and all follow R' Akiva" — R' Yochanan's map of the tannaitic corpora assigns the Tosefta's anonymous layer to R' Nechemiah, within R' Akiva's (Rabbi Akiva) school.	rabbinic	★★★★☆	Sanhedrin 86a
Compilation is traditionally credited to R' Chiya: the Rambam states "R' Chiya composed the Tosefta to elucidate the matters of the Mishnah," and the Talmud rules that any baraita not taught in the academies of R' Chiya and R' Oshaya is presumed corrupted and may not be used to refute in the study hall. The Talmudic statements establish the authority of the Chiya/Oshaya baraita collections; the identification of our Tosefta with that collection is the traditional (geonic-medieval) synthesis.	tradition rabbinic	★★★☆☆	Rambam, Introduction to Mishneh Torah Chullin 141b
Academic scholarship debates the Tosefta's relationship to the Mishnah: the classical view reads it as a post-Mishnaic supplement, while some modern scholars argue parts of it preserve versions earlier than our Mishnah.	reconstruction	★★★☆☆	J. Hauptman, Rereading the Mishnah (2005); S. Friedman, Tosefta Atiqta (2002)