15 Adar 5472
Rav Tzvi Hirsh Koidenover was born around the year 5410 in Vilna, to his father Rav Aharon Shmuel, author of Birchas Hazevach. As a bochur he learned under his father, as well as from Rav Yosef of Dubno, the author of Yesod Yosef.
Due to the Cossack riots, he was forced to flee with his father, and when he returned to Vilna, he began to engage in business and was very successful. After being accused in a false libel, he was imprisoned for a short time, and when he was released, he moved to Frankfurt, where he was appointed Rav.
In Frankfurt, he authored his renowned sefer Kav Hayashar, which over the years has been printed in dozens of editions and is considered an important mussar sefer. In the introduction to the sefer he explains the meaning of the name he chose for it: “הישר” has the same letters as הירש and קב is for the 102 perakim in the sefer, and because it is numerically equivalent to his .צבי name
His proficiency in Toras Hasnistar is revealed in his sefer. The Kozhnitzer Maggid would say that learning a passage of the Zohar from the sefer Kav Hayashar is mesugal to arouse a person’s soul more than learning from the sefer Hazohar itself. (Meir Einei Chachamim Parashas Emor)
The Kav Hayashar passed away in Frankfurt on 15 Adar II 5472 and he was laid to rest there.
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