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MB3 45a: Bameh Madlikin (270:1-2)
The reasons why we say bameh madlikin on Friday Night; saying it before or after maariv, and saying it on Chol HaMoed or when Yom Tov is Friday or Shabbos.
Correction: The Aruch Hashulchan states that the Zohar advises one to say Kegavna (and does not mention Bameh Madlikin).