Kanievsky took great effort to uphold the rulings and positions of Avrohom Karelitz, including: not relying on the
heter mechira during the
Shmita, prohibiting the use of electricity and water supplied through
Shabbat desecration, not relying on city
eruvs due to the difficulty of monitoring them from week to week, reading the
Book of Esther in
Bnei Brak also on
Shushan Purim out of doubt, and more. To many visitors, Kanievsky instructed growing a beard and placing
payot in front of the ears, prohibiting men from wearing
watches due to the prohibition of
cross-dressing in halakha, wearing long-sleeved shirts, writing Torah compositions, and more. He frequently advised people with various health issues to study Torah related to the nature of their ailment, either by its name or its content. Another prominent practice of his was encouraging early marriage around the age of eighteen, a practice followed by many of his grandchildren. In 2012, Kanievsky ruled that it is forbidden to possess or use a
smartphone without individual permission from a posek, and that owners are not allowed to sell their phones, but should instead burn them. In 2015, he instructed
United Hatzalah paramedics that in the event of a terrorist attack, they should not treat the terrorists before the victims, even if the terrorist is more seriously injured, and they may even leave the terrorist to die. In 2016, Kanievsky declared that
medical cannabis was
kosher for Passover as long as the possession of the cannabis is not in violation of the
law of the land. In 2011, he interpreted
Arab Spring uprisings as evidence that the
Messiah may be near. In 2015, following the
2014 Jerusalem synagogue attack, he repeatedly referred to the imminent arrival of the Messiah, and urged
diaspora Jews to make
aliyah (immigrate to Israel), reportedly resulting in the arrival of a substantial number of
French Jews. In February 2020, shortly before the
Israeli legislative elections, it was reported by one rabbi that Kanievsky had stated that the coming of the Messiah was possibly imminent.
Covid-19 At the beginning of the
COVID-19 pandemic in Israel (March 2020) and despite the
Ministry of Health’s directive to close all educational institutions, Kanievsky instructed that
yeshivas and
Talmud Torahs remain open, saying the neglect of Torah was more dangerous. Kanievsky told his followers that the best ways to defeat the virus were to avoid
lashon hara (gossiping about one's peers), to strengthen humility, and to place the needs of others before their own. As a result of the discussion, he was visited, on March 15, by senior police officials who, with great respect, wanted to ask him of the importance of following the orders of medical professionals with regard to the outbreak. with Bnei Brak having a high percentage of coronavirus cases in Israel, relative to its population, Kanievsky ruled that one who does not follow the Israeli Health Ministry's guidelines on
COVID-19 is in the position of a
rodef, i.e., one who pursues another with intent to kill, a murderer. He also ruled that telephones may be answered on
Shabbat to get
COVID-19 test results, and that
minyanim must not meet at all during the pandemic – a stricter requirement than the
Health Ministry's rules, which at the time allowed congregations to meet outdoors as long as participants are at least two meters (6 feet) distant from each other. In June 2021, he urged everyone, including ages 12–15, to
get vaccinated against COVID-19. On October 2, 2020, Kanievsky was diagnosed with COVID-19. On October 28, 2020, his physician said Kanievsky had recovered from the virus. During the second wave of the pandemic (October 2020), it was publicized in his name that the Talmud Torahs should reopen, contrary to government guidelines prohibiting it.
Responsa books from his answers Kanievsky extensively responded to those who sought his guidance across all Torah topics. However, he generally based his answers on the rulings of earlier sages and rarely issued new decisions. His responses were typically brief, often consisting of only a few words. From his written and spoken responses, an extensive literature of responsa has developed. Around one hundred books include his answers to questions posed by authors. Some notable books dedicated to his responsa include: •
Daat Nota – A compilation of halachic answers organized according to the order of the
Mishnah Berurah, with additional notes and clarifications from Kanievsky, as well as cross-references to other poskim added by an editorial team led by his son Yitzchak Shaul. Three volumes, 2009–2016. The series is expected to include around ten volumes. •
Derech Sichah – Questions on various topics arranged by the
weekly Torah portion, compiled by his student Eliyahu Man (based on his weekly
Shabbat meal discussions with Kanievsky), two volumes. •
Shama Tefilati – Explanations on the order of prayers based on his answers to Tzvi Yabrov, Bnei Brak, 2008. In 2012, a book titled
Me’Achorei HaPargod was published, featuring Torah insights and sayings on various topics from him and
Rabbi Steinman. Additionally, a weekly Shabbat bulletin called
Divrei Shi’ach was published, containing responses and words of Torah from him over the past week. Kanievsky customarily signed his books with the initials "ShICh BaHaGRYY", a
Hebrew abbreviation of Shmaryahu Yosef Chaim Ben HaGaon Rabbi Yaakov Yisrael. == Family ==