VaYakem Edut BeYaakov, letters and response to R. Yehonatan Eybeschutz's Luchot HaEdut, by R. Yaakov Emden. [Altona: R. Yaakov Emden, 1755]. Only edition.
The book was printed by R. Yaakov Emden in his home press in Altona, as part of his famous battle against R. Yehonatan Eybeschutz, whom he suspected of Sabbateanism. It includes a detailed review of the polemic from the point of view of R. Yaakov Emden, and brings letters sent by R. Yaakov Emden to the rabbis of the generation on the topic, and their responses.
Shortly before, R. Yehonatan Eybeschutz had printed the book Luchot Edut in his defense (see previous item), in which he brings letters of support from prominent rabbis and community leaders who defended his position. In the present work, R. Yaakov Emden published his response to R. Yehonatan Eybeschutz's book, recounting the polemic in detail and presenting letters he wrote to the rabbis of his times on the matter and their responses.
At that time, the Noda BiYehuda attempted to suggest a compromise under which R. Yehonatan Eybeschutz would set aside his problematic amulets and cease dealing in this field, yet R. Yaakov Emden refused to accept the compromise and began attacking the Noda BiYehuda as well.
The author's preface begins on the title page.

58, 59-66 leaves. Originally: 69, 50-66 leaves. Lacking 20 leaves: 59-69, 50-58 (five consecutive gatherings in middle of book). 24.5 cm. Wide margins. Leaves cut inexpertly and unevenly. Fair condition. Stains, including dampstains. Tears, including large open tears to title page and several other leaves, slightly affecting text, repaired in part with paper. New leather binding.