Rashi on Exodus 26:13/רש"י על שמות כ״ו:י״ג

1והאמה מזה והאמה מזה AND A CUBIT ON THE ONE SIDE AND A CUBIT ON THE OTHER SIDE — i. e. on the north and on the south,

2בעדף בארך יריעת האהל OF THE SURPLUS OF THE LENGTH OF THE CURTAINS OF THE TABERNACLE — i. e. which were in excess over the curtains of “the Tabernacle” (the woollen ones) by two cubits,

3יהיה מרוח על צדי המשכן SHALL HANG OVER THE SIDES OF THE TABERNACLE — on the north and on the south as I have explained above. The Torah here teaches you a rule of life — that a man should take care of his artistic objects (this the Torah does by commanding that the beautiful lower curtains should be protected by coarse upper ones) (Yalkut Shimoni on Torah 422).