Likutei Moharan, Part II 84:4/ליקוטי מוהר"ן·תנינא פ״ד:ד׳

14 . And this is the explanation of “in order to hakim (erect) His brit (covenant).” Erecting the brit (male organ) alludes to marital union. For initially there must be an arousal from below, namely, rectification of the Shekhinah .

2And when the Shekhinah dons radiant garments—white, red and yellow, corresponding to the Patriarchs—She is the concept of Sh’VuAh (an oath), the concept of ShiVAh (seven). It is as if the oath was made to the Patriarchs at this moment. This is: “that He swore to your forefathers, as this day”—specifically “as this day.” It follows, that through intense prayer the oath to the Patriarchs is renewed.