Charles Ellicott Commentary Exodus 26:30

"And thou shalt rear up the tabernacle according to the fashion thereof which hath been showed thee in the mount." — Exodus 26:30 (ASV)

According to the fashion thereof which was shewed thee. — See Exodus 25:9, Exodus 25:40. However minute—even tediously minute—the description, there would necessarily have been a multitude of particulars, not to be described in words, where Moses would have to be guided by the pattern that he had seen.