After his marriage, Epstein moved to his wife's hometown, in
Kovno, and was joined there two years later by Rabbi Meltzer, following his marriage to Epstein's sister-in-law, Baila Hinda Frank. In Kovno, the two scholars studied under the renowned mussar master, Rabbi
Yitzchak Blazer, known in
yeshivos as "Reb Itzele Peterburger", one of Rabbi
Yisrael Salanter's foremost disciples. It was there that they became intrigued with the study of mussar. In 1894, both rabbis started teaching in the famed Slabodka yeshiva, which was not far from Kovno. In 1897,
Nosson Tzvi Finkel, Slabodka's famed
mashgiach ruchani), invited Epstein to become the rosh yeshiva. Epstein accepted the post, while Meltzer moved together with some of his best talmidim to the town of Slutsk to lead the
Ridvaz's yeshiva there. The Slabodka yeshiva flourished under the joint leadership of Rabbis Epstein and Finkel, and many of its students were crucial in nurturing the spiritual level of the Jewish people in subsequent generations. For a list of notables, see
Slabodka yeshiva. In 1924, Rabbi Epstein was part of a delegation to the United States headed by Rabbi
Abraham Isaac Kook, chief rabbi of the Land of Israel. In 1924, Epstein, Finkel, and most of the yeshiva, relocated to
Hebron, in what was then British
Mandate for Palestine. The yeshiva thrived for five years in Hebron as it had in Lithuania. In late August 1929 mobs, incited by the antisemitic
Mufti of Jerusalem, swarmed the yeshiva, killing over 67 Jews and wounding many more, in an event known as the
1929 Hebron massacre. Among the victims was his American-born nephew Aaron David Epstein. In the aftermath, the British authorities evacuated the rest of the Jewish community. The yeshiva was relocated to the
Geula section of
Jerusalem, and was renamed
Yeshivas Chevron. In 1975, Yeshivas Chevron moved to its current location in
Givat Mordechai. ==Legacy==