Jamieson, Fausset and Brown on Exodus 25:40

40. look that thou make them after their pattern--This caution, which is repeated with no small frequency in other parts of the narrative, is an evidence of the deep interest taken by the Divine King in the erection of His palace or sanctuary; and it is impossible to account for the circumstance of God's condescending to such minute details, except on the assumption that this tabernacle was to be of a typical character, and eminently subservient to the religious instruction and benefit of mankind, by shadowing forth in its leading features the grand truths of the Christian Church.