《旧唐书·列传·卷四》
秦王把王世充带到长安，高祖历数他的罪行，王世充回答说： 按照我的罪过，实在是死有余辜，但您的爱子秦王曾许诺不杀我。 
秦王以世充至长安，高祖数其罪，世充对曰： 计臣之罪，诚不容诛，但陛下爱子秦王许臣不死。 
The Prince of Qin took Wang Shichong to Chang'an. The Supreme Ancestor recounted his crimes one by one. Wang Shichong replied, "My crimes are indeed worthy of death, but your beloved son, the Prince of Qin, once promised not to kill me."