...The festival of Shavuot is an auspicious time Above. On that day G-d confounds the "supernal accuser" of the Jewish people, similar to His confounding him during the sounding of the Shofar on Rosh Hashanah and on the holy day of the Fast of Yom Kippur
Hayom Yom 3 Sivan
Shavuot is an opportune time to do everything possible in improving one's Torah study and one's service of G-d, marked by fear of G-d, and also to strive in teshuva concerning Torah-study -- without interference by the accusing Satan -- similar to the time of the sounding of Shofar on Rosh Hashanah and the holy day of the Fast of Yom Kippur.
Hayom Yom 4 Sivan