L'shem yichud is From Shabsai Tzvi?! The Chida is Unforgiving of the Nodah B'yehuda's Accusation
Rabbi Mendel Krasnjanski
Source Sheet Is Sefiras Haomer Deoraisa (Rambam and Ravya) or Derabanan? Is it OK to follow kaballistic customs when one isn't "up to it"? When do we say L'shem Yichud and why? Story of the Chida and the golden staircase Chagiga, Rambam, Raavya, Chok yaakov, Noda b'yehuda, Chavos Yair, Zevachim, Teshuva MaiAhava - R Elazar Fleckels, R Yaakov Emden, Chida, Oir Layesharim - R Zaroch Eidlitz, Samach vov - Rebbe Rashab, Rebbe