Mei Hashiloach

Mordechai Yosef Leiner
Izhbitzer Rebbe
Term	1839–1854
Full name	Mordechai Yosef Leiner
Main work	Mei HaShiloach
Born	1801 Tomaszów Lubelski
Buried	Izhbitza
Dynasty	Izhbitza-Radzyn
Predecessor	(founder)
Successor	Yaakov Leiner
Father	Yaacov Leiner of Tomashov
Children	Yaakov Leiner
Children 2	Shmuel Dov Asher Leiner

Mordechai Yosef Leiner of Izbica (Yiddish: איזשביצע, איזביצע Izhbitze, Izbitse, Ishbitze‎) (1801-1854) was a rabbinic Hasidic thinker and founder of the Izhbitza-Radzyn dynasty of Hasidic Judaism.

Rabbi Mordechai Yosef was born in Tomashov (Polish: Tomaszów Lubelski) in 1801 to his father Reb Yaakov the son of Reb Mordechai of Sekul, a descendant of Rabbi Saul Wahl. At the age two he became orphaned of his father. He became a disciple of Reb Simcha Bunim of Peshischa where he joined Rabbi Menachem Mendel of Kotzk and Rabbi Yosef of Yartshev; both were also born in Tomashov. When Rabbi Menachem Mendel became Rebbe in Kotzk, Reb Mordechai Yosef became his disciple there; then in 1839 became himself a rebbe in Tomaszów, moving subsequently to Izbica.

His leading disciple was Rabbi Yehuda Leib Eiger (1816-1888), grandson of Rabbi Akiva Eiger. His students included Rabbi Zadok HaKohen of Lublin (1823–1900), his son, Rabbi Yaakov Leiner (1828–1878) and his grandson Rabbi Gershon Henoch Leiner of Radzyn.

Mordechai Yosef Leiner is buried in an ohel on the Jewish cemetery in Izbica.

Rabbi Leiner is best known for his work Mei Hashiloach, a compilation of his teachings by his grandson, in which he expressed the doctrine that all events, including human actions, are absolutely under God's control, or as Rabbinic discourse would phrase it, by "hashgacha pratis." Thus, if everything is determined by God, then even sin is done in accordance with God's will. He presents defenses of various Biblical sins, such as Korach's rebellion, Pinchas's zealotry, and Judah's incident with Tamar.

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