《资治通鉴·唐纪·唐纪二》
窦建德假意和魏刀儿联合，魏刀儿放松了戒备，建德袭击并打败了他，于是包围了深泽；魏刀儿的部下绑了他投降，窦建德斩了魏刀儿，合并了他全部队伍。
建德伪与连和，刀儿弛备，建德袭击破之，遂围深泽；其徒执刀儿降，建德斩之，尽并其众。
Dou Jiande pretended to ally with Wei Daoren, who relaxed his guard, Jiande attacked and defeated him, and then besieged Shenze; Wei Daoren's subordinates tied him up and surrendered, so Dou Jiande beheaded Wei Daoren and annexed his whole army.