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Sifrei ספרי

The halakhic midrash on the last two books of the Torah, completing the tannaitic verse-commentary set alongside the Mekhilta (Mekhilta DeRabbi Yishmael, Shemot) and Sifra (Sifra, Vayikra). Modeled as one entity under its traditional single title, with the two-school composition recorded as a claim.

I. Who

Hebrew
ספרי
Also known as
Sifrei Bamidbar, Sifrei Devarim
Era
tannaim

II. When

Traditional
tannaitic; anonymous layer of R' Shimon, per R' Akiva's school
Academic
redacted c. 3rd c. CE; Bamidbar and Devarim portions from different schools
Duration
≈70 years
Precision
disputed

IV. What

Language
Mishnaic Hebrew
Redaction
"The anonymous Sifrei is R' Shimon... and all follow R' Akiva" (Sanhedrin 86a) — R' Shimon bar Yochai is Rabbi Shimon bar Yochai, R' Akiva Rabbi Akiva. The Rambam's tradition credits Rav with the compilation, as with the Sifra (Sifra).
Structure
Halakhic midrash on Bamidbar and Devarim, transmitted under the single title "Sifrei" but comprising two distinct works: Sifrei Bamidbar (starting at the priestly laws of chapter 5) and Sifrei Devarim (centered on the legal core of chapters 12–26).

V. How do we know

ClaimEvidenceConfidenceSources
R' Yochanan assigns the Sifrei's anonymous layer to R' Shimon (bar Yochai), within the school of R' Akiva: "the anonymous Sifrei is R' Shimon... and all follow R' Akiva." rabbinic ★★★★☆
The Rambam records that Rav composed the Sifra and the Sifrei to elucidate the principles of the Mishnah. tradition ★★★☆☆
Academic analysis of terminology and named authorities shows the single title covers two works of different provenance: Sifrei Bamidbar exhibits the style of R' Yishmael's school, while Sifrei Devarim is in its legal core a product of R' Akiva's school — partially crossing the Talmud's own one-line attribution.
The Sefaria refs verify the two works' existence and openings; the school analysis is the cited scholarship's.
reconstruction ★★★★☆