Parshas Vayakhel - The Secret Life of Oholiav
(This shiur in many ways is the continuation of Parshas Ki Tisa - The Secret Life of Hur https://www.nitzotzos.com/blog/parshas-ki-tisa-the-secret-life-of-hur It certainly can be understood on its own accord but we would definitely recommend listening to both to have a more complete picture.)
Ask someone who built the Mishkan and they will give you answers like "all of Klal Yisrael" and "Betzalel." In truth there is an unsung hero, Oholiav. Who was Oholiav? What was his role relative to Betzalel? Why does it matter to us? In this shiur, Rav Burg teaches us that in building a dwelling place for God we need some Tzaddikim who are Godly and some Tzaddikim who are worldly.