Likutei Moharan 3:2/ליקוטי מוהר"ן ג׳:ב׳

12. Now, it is brought in the writings of the Ari, of blessed memory, that the birds of the kelipah are the intellect of Malkhut d’Kelipah (Kingdom of the Other Side), whereas these two live pure birds are the concept of building up Malkhut d’Kedushah (Kingdom of Holiness).

2David was therefore lauded before Shaul as one “who is skilled at playing music” (1 Samuel 16:18). This is because song is the concept of building up Malkhut, which is why [David] was deserving of malkhut (kingship). Thus, of [David] it is written, “From behind the nursing ewes He brought him <to tend His people Yaakov>” (Psalms 78:71). <“From behind the nursing ewes”>—that is, from behind those that suckle. This refers to Netzach and Hod, for they nourish the prophets and are the concept of building up Malkhut.