In the summer of 1666, Shabtai Tzvi’s conversion to Islam shattered hopes and dreams, leaving Jewish communities grappling with the aftermath of a false redeemer. One contentious issue arose in Amsterdam, where leaders debated whether to continue the performance of Birchas Kohanim each Shabbos, initiated during Shabtai’s self-proclaimed messianic era. Rabbi Yaakov Sasportas penned a series of halachic responsa on this matter, tackling the challenge of ideas proposed by flawed individuals and customs initiated by misguided beliefs.

In the Wake of Shabtai Tzvi’s Betrayal