Rabbi Nachum Rabinovitch ZT”L

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  • Just because the below authorities wearing Techeiles are listed doesn’t mean we have contact info on all of them. This is for informational purposes only.

Joel Guberman told me the following:

  1. He wore Rambam 7 with knots and not Rambam 13 with knots,
  2. He was not a proponent of making it well known, and
  3. He wore Techeiles on his Tallis Kattan and not Tallis Gadol for Yuhara reasons. For that matter he was also personally against wearing even white Tzitzis out as well.


Bio from Wikipedia:

Nahum Eliezer Rabinovitch (Hebrewנַחוּם אֱלִיעֶזֶר רָבִּינוֹבִיץּ׳‎; 30 April 1928 – 6 May 2020), born Norman Louis Rabinovitch,was a Canadian-Israeli Religious Zionist rabbi and posek. He headed the London School of Jewish Studies from 1971 to 1982, and the hesder yeshiva Birkat Moshe in Ma’ale Adumim from 1982 until his death.

Early life and education

Nahum Rabinovitch was born in Montreal, Quebec to Sarah (née Weiner) and Sam Rabinovitch. After completing an eight-year course of studies under Rabbi Pinchas Hirschsprung, Rabinovitch received semicha from Montreal’s Yeshivas Merkaz HaTorah in the city’s first rabbinical ordination ceremony.

After obtaining an honours degree in commerce from Sir George Williams College, he left for Baltimore to pursue a Master of Science degree in mathematics at Johns Hopkins University. While there, he studied at Yeshivas Ner Yisroel, where he received a second ordination from Rabbi Yaakov Yitzchok Ruderman.


Between 1955 and 1963, Rabinovitch served as spiritual leader of the Brith Sholom Beth Israel Congregation in Charleston, South Carolina. In this role, he helped establish the city’s first Jewish day school, of which he served as principal. He also held appointments as lecturer in mathematics at the College of Charleston and chaplain to the Sixth Naval District Headquarters.

In 1963, he was called to serve as a community rabbi in Toronto, and assumed the pulpit of the Clanton Park Synagogue in Downsview. He completed a Ph.D. in the philosophy and history of mathematics at the University of Toronto in 1971 under the supervision of Kenneth O. May. His doctoral thesis, Probability and Statistical Inference in Ancient and Medieval Jewish Literature, was published as a monograph in 1973.

Rabinovitch was appointed principal of Jews’ College in early 1970, and settled in London that spring. Notable among his students at the College was Chief Rabbi Lord Jonathan Sacks, who has cited Rabinovitch as his primary role model. Ten years later, he accepted an offer to become rosh yeshiva of Yeshivat Birkat Moshe, a hesder institution in Ma’ale Adumim.

In 2015, together with a group of prominent Israeli rabbis, Rabinovitch established Giyur Kehalacha, an independent beit din offering conversions outside of the Chief Rabbinate.

Philosophical and political views

Rabinovitch published Halakhic rulings on various subjects, including organ donationsurrogacybirth controlarmy serviceShabbat, and kashrut. His philosophical approach, influenced by Maimonidean rationalism, emphasized the connection between philosophy and Halakha, between Torah and scientific studies, and between theoretical learning and practical applications.

Rabinovitch was an authority on the writings of Maimonides, about which he published numerous books and essays. He is perhaps best known for his fourteen-volume Yad Peshuta (lit. ‘Outstretched Hand’), an in-depth commentary on Maimonides’ Mishneh Torah. He also authored Melumdei Milḥamah (lit. ‘Learned in War’), a collection of responsa dealing with Halakhic issues facing religious members of the Israel Defense Forces.

Rabinovitch was a religious Zionist, a supporter of the settlement movement, and a vocal opponent of the Oslo Accords. He was, however, often more liberal in social and religious matters than many in the religious Zionist movement. In an interview, Rabinovitch said that he backed religious studies for women, and did not see a problem in Halakhic decisions taken by women. Nonetheless, he signed a letter in 2019 agreeing with the Chief Rabbinate‘s opposition to religious Jewish women serving in the IDF. He also ruled that it is incumbent on Israeli combat medics and doctors to treat and save the lives of Palestinian combatants, even if wounded in the course of attacking Israelis. Rabinovitch characterized Christianity and Islam positively as movements that spread monotheismmorality, and messianic hope. 

In 1995, Rabinovitch was among a group of rabbis accused of indirectly influencing Yigal Amir to assassinate Prime Minister Yitzhak Rabin, having branded Rabin a moser and likened his government to Nazis. The previous summer, he had also issued a ruling that Jewish soldiers should disobey any government orders to vacate West Bank army bases. 

Personal life

Rabinovitch had six children, including British journalist Dina Rabinovitch (born in 1963), who died in 2007 of breast cancer.

Tying Method

MethodString RatioURL
Rambam 13, with first and last double knotRambam


Jerusalem: Daʻat Torah.1971
Toronto: University of Toronto Press.1973
Darkah shel Torah [דרכה של תורה] (in Hebrew).Ma'ale Adumim: Maaliyot Press.1998Link
Ma'ale Adumim: Maaliyot Press.2004
Siach Nachum [שיח נחום] (in Hebrew).Ma'ale Adumim: Maaliyot Press.2008Link
Iyunim be-Mishnato shel ha-Rambam [עיונים במשנתו של הרמב״ם] (in Hebrew).Ma'ale Adumim: Maaliyot Press.2010Link
Ma'ale Adumim: Maaliyot Press.2015
Ma'ale Adumim: Maaliyot Press.1977–2016


Wearing Frequencies

Tallis KottonAlwaysAlways

What He Does


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