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Sefer Yeshayahu ספר ישעיהו

The great book of consolation — the Gemara's own label for it is "all comfort" (כוליה נחמתא). Its prophecies are Yeshayahu's, but the baraita of Bava Batra says "Chizkiyah and his colleagues wrote" it: a royal circle, not a lone author, committed the prophet's words to final written form. Rashi there explains why the prophet did not do it himself — prophets wrote their books before their death, and Yeshayahu was killed by Menashe before he could; the circle of Chizkiyah's generation who outlived him did the writing. The edge here points to Chizkiyah as the named anchor of that collective.

I. Who

Hebrew
ספר ישעיהו
Also known as
Yeshayahu, Isaiah, Book of Isaiah
Era
bible

II. When

Traditional
committed to writing by Chizkiyah and his colleagues, c. 3199–3260 AM, per Bava Batra 15a
Academic
chs. 1–39 largely 8th c. BCE; chs. 40–66 dated by most scholars to the exilic and post-exilic periods
Duration
≈61 years
Precision
approximate

IV. What

Language
Biblical Hebrew

V. How do we know

ClaimEvidenceConfidenceSources
"Chizkiyah and his colleagues wrote — ימש״ק is the mnemonic — Yeshayahu, Mishlei, Shir HaShirim, and Kohelet" (חזקיה וסיעתו כתבו ישעיה משלי שיר השירים וקהלת): the baraita of Bava Batra, assigning the writing to a circle rather than an individual. The edge to Chizkiyah (Chizkiyahu) stands for the whole collective. rabbinic ★★★★☆
"Wrote" (כתבו) here means committed to writing, not composed: Rashi explains that prophets wrote their books only before their death (שלא היו הנביאים כותבים ספריהן אלא לפני מותן), and Yeshayahu, killed by Menashe, never did — so Chizkiyah's circle, "the men of his generation who lived on after him," wrote his prophecies down.
The explanation is Rashi's classic gloss on the baraita; the Gemara itself states the attribution without spelling out the mechanism.
tradition ★★★☆☆
Timeline placement c. 3199–3260 AM: Chizkiyah's reign and the generation after it, when the circle that outlived the king (and the prophet) did its editorial work. The span is schematic. tradition reconstruction ★★★☆☆