Rashi on Numbers 9:15/רש"י על במדבר ט׳:ט״ו

1המשכן לאהל העדות means THE TABERNACLE which is made FOR the purpose of being THE TENT for the tablets of THE TESTIMONY.

2יהיה 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).