Musar su I Samuele 16:17

The effect of the serpent's pollutants had continued unabated until the birth of the twin brothers Jacob and Esau. At that point, most of the pollutants absorbed by Esau, remained tattooed on the thigh of Esau, so that it could be said of Jacob (as did Bileam) that he was not infected by the serpent. Samael, the spiritual patron of Esau, touched and injured the thigh joint of Jacob, causing a degree of impurity conferred through bodily contact; this was transferred to the ירך of the tribes because they bowed before Esau who represented an alien deity. Ever since then the tribes were in need of spiritual refinement. Benjamin, on the other hand, was above the need for such refinement; this is why one of his descendants, Saul, was first able to wear the "crown" of kingdom. Thus it came about that every Jew bowed before Saul the representative of Benjamin. Such a situation, however, could not endure for long because Saul was not anointed by means of a קרן. Only David and his descendants could be anointed by oil poured from the קרן. The kingdom of שאול was only a "borrowed" kingdom, as the name שאול implies. שאול was anointed from a cruse because the time was not yet ripe for אדם to be rehabilitated, a task that was reserved for David, who was Adam's reincarnation. The mystique of פכים קטנים is alluded to in Samuel I 16,17 where Samuel says to Saul: הלא אם קטון אתה בעינך, "Even though you regard yourself as small (insignificant), etc." The reference to Saul's "smallness" was to the fact that Benjamin was the youngest of the brothers. Samuel told Saul that the reason he had been chosen to become king was precisely because he was a member of the youngest (smallest) tribe, since his ancestor had not bowed to Esau because he had not had a chance to, not having been born yet.