Likutei Moharan 57:3/ליקוטי מוהר"ן נ״ז:ג׳

13. When the hands are rectified through a vow, as mentioned above, then the lights of the patriarchs shine in him. This is because a vow is the aspect of the light of Yaakov, and the hands are Avraham and Yitzchak, who are right and left. This is the aspect of “He performed wonders in the sight of their fathers” (Psalms 78:12)—i.e., through the above mentioned wonder, the light of the patriarchs shines in him.

2Thus, the final letters of the names of the patriarchs, B - K - M, are an acronym for “B’shemen Kodshi Meshachtiv (I anointed him with My holy oil)” (Psalms 89:21). This hints to the aspect of a vow, for it is written in the vow of Yaakov (Genesis 28:22), “Let this rock that…”; and it is written (ibid. 35:14), “then he poured oil on it.” In other words, by means of a vow, the light of the patriarchs shines on a person.