Tafsiran Bilangan 9:15: Rashi, Ramban, Tur HaArokh & Siftei Chakhamim

המשכן לאהל העדות means THE TABERNACLE which is made FOR the purpose of being THE TENT for the tablets of THE TESTIMONY.

AND ON THE DAY THE TABERNACLE WAS RAISED UP. Now He resumes the telling of the journey [through the wilderness] and the commandments which they were commanded about it, such as the trumpets, which Moses was now commanded were to be for the calling of the congregation, and for causing the camps to set forward.⁹⁴Further, 10:2. The sense of the expression [And on the day the Tabernacle was raised up] the cloud covered the Tabernacle, even the Tent of the Testimony is to state that the cloud covered only the Tent of the Testimony, but not the court of the Tabernacle.

וביום הקים את המשכן, “and on the day the Tabernacle had been erected, etc.” now the Torah resumes the report of the Israelites’ journeys in the desert, prefacing it with the reminder that the clouds of G’d’s glory covered the Tent of Meeting by day and that it would be replaced each evening by a fire visible all night. The movements of these clouds or the fiery appearance would signal that the people were to either break up and move, or make camp, as the case might be. Audible signals were heard by means of the trumpets, as we shall be told in chapter 10

יהיה על המשכן WAS UPON THE TABERNACLE — This has the sense of: was continuously being upon the Tabernacle. Similar is the usage in the whole section (i. e. the verbs יסעו, יחגו, ישכון etc. are imperfects expressing continuous action).