From the Chassidic Masters

13 chapters are filled with the details of the Sanctuary's construction, from the dimensions of its pillars to the colors of its tapestries. In contrast, the Torah devotes one chapter to its account of the creation and three chapters to the revelation at Mount Sinai...

The Torah devotes one chapter to its account of the creation of the universe, three chapters to its description of the revelation at Mount Sinai, and eleven chapters to the story of the Exodus. In contrast, no less than thirteen chapters are devoted to the making of the Mishkan

The deeper meaning behind the different opinions in the Talmud and commentaries regarding the menorah’s spatial alignment inside the Temple, and regarding the identity of its miraculous “western lamp.”