Reb Sholom of Belz says that whoever learns and completes Rashi on the Parsha each week is assured that he will be able to sit in the Mesivta of Rashi in Olam Habah.
The Rebbe of Pinsk-Karlin told over the following story:
There were a group of students traveling to Meron, and they flipped over, causing the death of 3 of them, R’L. The chavrusa of one of these students was extremely saddened by the death of his dear friend. One night this dead friend came to him in a dream and said: “Don’t be sorrowful. Remember how we used to learn chumash and Rashi, every week, with great diligence. Now, when I came to the Upper World, they judged that I should be admitted into the chamber of Rashi in Gan Eden, and therefore there is no need for you to be in sorrow”.
(Segulas HaBesht V'Talmidov)