פירוש על שמואל ב 20:21

Lifted his hand against the king, Dovid. Against the king even if it were not Dovid he is punishable by death. Alternatively if it were against Dovid [who is a scholar] even if he was not the king, he [Shevah] is punishable by death. All the much more so [now that he has rebelled] against the king, against Dovid. This is how this verse is expounded upon in the Midrash Koheles.