《资治通鉴·隋纪·隋纪七》
左亲卫窦琮是窦炽的孙子，他也逃亡在太原，因平时与李世民不和，常常自己生疑。李世民特别加意对待他，他可以随意在府上出入走动，窦琮的疑心才消除。
左亲卫窦琮，炽之孙也，亦亡命在太原，素与世民有隙，每以自疑；世民加意待之，出入卧内，琮意乃安。
Dou Cong, the left general of the bodyguard, was the grandson of Dou Chi. He also fled to Taiyuan, but because he had a disagreement with Li Shimin earlier, he often doubted himself. Li Shimin treated him with special care and allowed him to come and go as he pleased in his residence. Only then did Dou Cong's suspicions disappear.