חסידות אויף שמואל א 16:18

Therefore David was [thus] praised in the presence of Shaul (Shmuel I 16): "who is skilled at playing," for playing is building the Malkhut, therefore he was fit for Kingship. And this explains the scripture about him (Ps. 78): "from following the nursing ewes He brought him," i.e. from following the nursing ones, i.e. Netzach and Hod [see Appendix]. For they nurse the prophets, and they are the construction of the Malkhut:

In Samuel II 23,8 the author lists 30 “heroes” that ‎surrounded David, there is an interesting comment by ‎‎Rashi on verse 18 about Avishai, described as the ‎ראש ‏השלישי‎, being the leader of a group of “three.” Rashi says ‎that this group of three was free from sin. This sounds plausible ‎as the attributes possessed by David, as listed in Samuel I 16,18 ‎are ‎גבור חיל, נבון, ואיש תאר‎, “a capable, stalwart fellow, sensible, ‎and of handsome appearance.” These three attributes ‎distinguished Joseph from his early youth. When Joseph had a ‎vision of David who possessed attributes similar to his own, this ‎prompted him to donate 37 years of his life so that David would ‎be able to accomplish his purpose in life. He most certainly did ‎not want to commit a sin that would make him forfeit the chance ‎of being compared with the illustrious David.‎