Likutei Sichos, Vol 32, Tzav Rabbi Chaim Wolosow
https://www.torahrecordings.com/likutei-sichos/032/003_001 The Rebbe examines whether Moshe Rabbeinu had the status of Kehunah during the seven days of the Mishkan’s inauguration. Through Rashi and the Talmudic opinions, the sicha explains that Moshe’s Kehunah was unique and connected to his role as the recipient of Hashem’s word in the Ohel Moed.