Chasidut · Breslov
Likutei Halakhot, Orach Chaim, Laws of Morning Conduct 5:8/ליקוטי הלכות·
אוְעַל־כֵּן מִתְעַנִּין בְּיוֹם הַיָארצַייט – לְהַכְנִיע מְזוֹנָא דְּגוּפָא עַל־יְדֵי הַתַּעֲנִית, כִּי עַל־יְדֵי כָּל הַנַּ״ל זוֹכִין לְהַכְנִיעַ מְזוֹנָא דְּגוּפָא לְגַבֵּי מְזוֹנָא דְּנִשְׁמָתָא, כַּמְבֹאָר שָׁם בְּהַתּוֹרָה הַנַּ״ל, עַיֵּן שָׁם הַתּוֹרָה הַנַּ״ל מִתְּחִלָּתוֹ לְסוֹפוֹ, וְאָז תָּבִין דְּבָרֵינוּ בְּעֶזְרַת הַשֵּׁם־יִתְבָּרַךְ.
1FASTING ON A YAHRTZEITReb Noson briefly relates the practice of fasting on a yahrtzeit to another key element in the Rebbe’s lesson: increasing the power of the soul over the body. This is a fundamental component in the revelation of daat and will be most evident when the world will be renewed in the future.Therefore one refrains from food and drink on the day of the yahrtzeit, in order to subdue the influence of the body’s sustenance through the fast. For by means of all the above tikkunim we merit subduing the body’s sustenance in relation to the soul’s sustenance, as explained in the Rebbe’s lesson.82 Study well that lesson from start to finish, and then with HaShem’s help you will understand what we have discussed.