Likutei Moharan 3:8/ליקוטי מוהר"ן ג׳:ח׳

18. “From behind the nursing ewes He brought him” —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 . This is the meaning of, “From behind the nursing ewes.” King David had the ability to rectify and uplift even the song of someone who was not virtuous, to elevate it to holiness.

2This is: From behind the nursing ewes He brought him… —referring even to the song that is from the AChoRey (back) of holiness; corresponding to “From AChaR (behind) the nursing ewes,” from achar those that suckle. For song that is holy is from the place that the prophets nurse. But song that is not holy corresponds to “From achar the nursing ewes…”—from the achorey of holiness. King David was able to correct this song as well. And as a result, Malkhut of Holiness ascended. This is: “From behind the nursing ewes He brought him to tend [His people] Yaakov….” For it was through this that [David] merited malkhut (kingship).