This Halacha is an excerpt from our Sefer
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5. How does one spiritually prepare for the Holiday of Shavuos?
The main preparation is done through learning Torah. This especially applies towards learning the laws applicable to the Holiday, and the sections in Nigleh [Tractate Shabbos 86a-90] and Chassidus [Mamar in Torah Or Pashas Yisro “Bechodesh Hashlishi] which discuss the giving of the Torah. The learning of the above mentioned Mamar is to be publicized.
 See Sefer Hasichos 1988 2:462