Likutei Sichos Vol 28 Erev Chag HaShavuos Rabbi Chaim Wolosow Rabbi Chaim Wolosow
https://www.torahrecordings.com/likutei-sichos/028/003_001 לקוטי שיחות חלק כח - ערב חג השבועות Likutei Sichos Vol. 28 – Erev Chag HaShavuos - Erev Matan Torah — Building the Mizbeach in the Midbar The Rebbe explains why Moshe Rabbeinu’s building of the Mizbeach on the fifth of Sivan expressed the essence of Matan Torah: transforming the physical world into holiness and making a dirah b’tachtonim. This reveals the deep connection between Erev Shavuos and Parshas Bamidbar.