This choveres of Shnayim Mikra V'echad Targum discusses the obligation to review the weekly Parsha before Krias Hatorah on Shabbos, twice in the original Lashon Hakodesh and once in the Aramaic Targum Onkelos. The Gemara in Brachos (8a–b) promises that one who completes his weekly parsha together with the tzibbur is rewarded with a long life.

The Rishonim debate the reason for this takanah. Is it so that one completes the learning of the entire Torah shebischsav on a regular annual cycle, and gains a better understanding of it? Or is it specifically tied to the kriah in Shul, so that one becomes familiar with the Krias HaTorah by preparing the material beforehand? This question has various halachic ramifications, as discussed in this sugya.

 Some of the questions discussed:

•  What is the reason for this takanah?
•  What is the significance of arichus yamim in connection with Shnayim Mikra?
•  Does one need to do Shnayim Mikra on the Yom Tov leining?
•  When can one begin, and what is the deadline?
•  Does one have to read the haftorah as well?
•  Why twice in the original and once in Targum?
•  Can one be mashlim on Simchas Torah?
•  Why is there a special hiddur to finish before the Shabbos day seudah?
•  Are Bnei Torah also obligated, even though they learn Torah all week?