John Gill 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)

And you shall rear up the tabernacle
When thus finished, and all the furniture belonging to it completed:

according to the fashion thereof, which was shown to you in the mount ;
this is the third time that this is observed to Moses in the account of the tabernacle; which shows how punctually God would have the pattern observed he had given him, and that all things might be particularly and exactly done according to it, see (Hebrews 8:5) .