Tikkun Leil Shavuos
Shemiras Halashon on this Night is a Segulah for Yiras Shomaym:
Sefer Ohr Einayim (Kamarna) writes that from the beginning of the night of erev Shavuos until after Tefillas Mussaf, one must be careful not to speak any senseless words. Rather, one should focus on connecting to Hashem the entire time, as this is a segulah for yiras shomayim for the entire year.
Learning the Beginning and the End is Considered Like Learning the Entire Thing:
Rav Tzvi Elimelech of Dinov zy”a (Sefer Derech Pekudecha) writes: There is a tradition amongst the wise men of Yisroel that if, for some reason, one is unable to learn a sefer in its entirety, he should just learn the beginning and the end, and this is considered as if he learned the entire thing. Therefore, the common minhag is to say Tikkun Leil Shavuos, as this contains the beginning and end of all the sefarim of Tanach and the six books of Mishnah, and this is considered as he learned the entire written and oral Torah.
The Tikkun is a Siman for the Entire Torah:
Sefer Siach Sarfei Kodesh relates that the Dubno Magid zt”l once spent Shavuos with the Vilna Gaon zt”l, and saw him reciting Tikkun Leil Shavuos. The Magid did not recite the Tikkun. Instead, he learned Gemara. The Gaon asked the Magid why he wasn’t saying Tikkun, and the Magid said, “I will answer you with a moshol...” This is the moshol he related: A young Kollel man was married for several years and his father-in-law began pressuring him to get a job. He asked what type of work he should do, and his father-in-law suggested that he go to the marketplace to see what other people were doing, and he should do the same. He went to the market and saw that there were shops with merchandise hanging outside them. He decided to do the same. He rented a booth and hung some wares outside, but he had nothing inside his actual shop. People came inside to make purchases but he had nothing to sell them. The young man went back to his father-in-law and complained that he had done the same thing as everyone else, but he hadn’t made any money. His father-in-law explained that the other shops hung some wares outside to advertise what they had inside. Their main merchandise was actually inside the shop. So too, the Dubno Magid said, the Tikkun contains only the beginning and end of each Parshah. It is only an “advertisement” for the rest of the Torah. The Vilna Gaon, he said, knows all of the Torah, so it is good for him to have this advertisement. But I cannot have the advertisement alone, without also making sure I have the merchandise.
Staying Up All Night:
The Rashab of Lubavitch zy”a said that he had a handwritten manuscript written by the Mittler Rebbe zy”a that states that anyone who stays up all night on Shavuos will merit receiving the kesser Torah. He added, “And the Mittler Rebbe was a Posek.” The Rashab then stood on his feet and said, “Everyone listen! On Shavuos night, we have to stay awake.” He then sat down and said, “This means to literally stay up and not to sleep.”
