《资治通鉴·唐纪·唐纪五》
窦建德准备按照凌敬的建议行事，但是王世充连续不断地派人来告急，王琬、长孙安世也日夜哭泣，请求窦建德援救洛阳，又暗地里用金玉收买窦建德手下的将领，阻挠凌敬的计划。
建德将从之，而王世充遣使告急相继于道，王琬、长孙安世朝夕涕泣，请救洛阳，又阴以金玉啖建德诸将，以挠其谋。
Dou Jiande was going to act according to Ling Jing's suggestion, but Wang Shichong kept sending people to ask for help. Wang Wan and Changsun Anshi also cried day and night, begging Dou Jiande to rescue Luoyang. Secretly, they also took gold and jade to bribe Dou Jiande's subordinates to obstruct Ling Jing's plan.