Likutei Moharan 6:8/ליקוטי מוהר"ן ו׳:ח׳

18. This is the explanation [of the opening verse]: {“Then God said to Moshe, ‘The time is coming for you to die. Kra et Yehoshua (Summon Yehoshua) and present yourselves in the Tent of Meeting, where I will appoint him.’”}

2Then God said to Moshe… summon Yehoshua — Moshe represents the upper point of the aleph and Yehoshua the lower point.

3and present yourselves in the Tent of Meeting — This alludes to the firmament, to the vav in the middle of the aleph.

4where I will appoint him — It was then necessary for Moshe to hand everything over to Yehoshua, however, “There is no authority on the day of death” (Ecclesiastes 8:8). For at the time of the tzaddik’s passing he does not have the authority and strength to shine into <another>. Therefore, <God said,> “where I will appoint him”— I, Myself, for rulership returned to the Holy One.