《旧唐书·列传·卷四》
因此郡里县里料定窦建德跟盗匪们相互勾结，就拘捕了他的家属，不论老少都杀掉了。
由是郡县意建德与贼徒交结，收系家属，无少长皆杀之。
Therefore, the county and county assumed that Dou Jiande had colluded with the rebels, so they arrested his family and killed all of them, regardless of their age.