Are the Yom Kippur prohibitions of washing, anointing, wearing leather shoes, and marital relations Biblical (d'oraita) or Rabbinic (d'rabbanan)?
Synopsis
Major dispute: The Rambam holds these prohibitions are d'oraita (Biblical), derived from 'Shabbat Shabbaton.' The Rosh holds they are d'rabbanan (Rabbinic), and the verses are merely asmakhta. The Mishnah Berurah reports both views and rules one should be strict in practice.
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