Likutei Moharan 21:17/ליקוטי מוהר"ן כ״א:י״ז

117. And this corresponds to the seven days of mourning, God forbid. [We mourn over a person whose soul has expired] so that his soul will ascend to the light of the face [by means of these seven days] {see above}. Therefore, a mourner is obligated to perform KRiAh (rending one’s garment). This is because KRA is numerically equivalent to ShA (370), <namely the ShA lights of the supernal face which are drawn from the rectification Truth, as is known>. This is numerically equivalent to two times the Holy Name El, when spelled out. For El is the light of the face <as is known>.