Daily Teachings of The Baal Shem Tov:
“The Baal Shem Tov instructed his followers to immerse in a mikveh every erev Shabbos [and erev Yom Tov] as well as before praying on Shabbos morning.”
(Sefer HaSichos 5702, cited in Sefer HaMinhagim Chabad; Siddur HaAri of Rabbi Shabbbsai of Rashkov)
SOURCE: Baal Shem Tov Foundation
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