Daf Yomi - Sukkah 43 - Sukkah and the Mishkan

The Gemara states that the obligation to dwell in a Sukkah is by day and by night. This is derived by employing a gezeirah shavah from the Miluim, the inauguration of Aharon and his sons into the service of the Mishkan. It is noteworthy that the sefarim write that the Sukkah reflects the Bais HaMikdash, so it is appropriate that we derive the mitzvah to dwell in the Sukkah from the Mishkan. A further association between Sukkos and the Mishkan is that the Vilna Gaon is of the opinion that we celebrate Sukkos on the fifteenth of Tishrei because that is when the Clouds of Glory returned to shield the Jewish People. The Clouds of Glory were a sign that HaShem was pleased with the Jewish People, and the building of the Mishkan was also a sign that HaShem had forgiven the Jewish People for worshipping the Golden Calf.