פרשת תרומה Parsha Stumpers and Something to Think About What  were the three ways which the B'nei Yisroel could participate in to  help build the aron ? The  Gemara tells us that Betzalel was the one who had to correct Moshe  and tell him to build the mishkan first before its keilim  (vessels).  Didn't Moshe already know this from Hashem? And even if not, why  didn't he think to build the mishkan first anyway? Why  is it that the dimensions of the aron are all incomplete measures? (Shemos  25:10) Hashem commanded that the poles of the aron never leave it.  Why? The  aron was made of three arons : gold, wood, and gold. How do we know  that it is from three arons together and not just a wooden one with  gold on inside and outside? Also, what is the significance of being  made with three arons as opposed to one? Rashi  (25:21) sites a machlokes as to whether the luchos were placed into  the aron before the lid had been placed on it to complete it, or  after it had been put on ...