Lev Tahor (Hebrew: לֵב טָהוֹר, lit. "pure heart") is an extremist Jewish sect founded by Shlomo Helbrans in 1988. Often described as a cult, it consists of about 200–300 members. The group follows a fundamentalist form of Jewish practice and adheres to its own atypical interpretations of Jewish law, including practices such as lengthy prayer sessions, arranged marriages between teenagers, and head-to-toe black coverings for girls and women beginning at the age of three.
https://en.wikipedia.org/wiki/Lev_Tahor