《北史·列传·卷二十六》
曹旦的长史李公淹和大唐的使者魏征等劝说曹旦和齐善行，让裴矩归顺大唐，曹旦等答应了，便让裴矩与魏征、李公淹带着曹旦及所有的印玺，贡献出山东一带的土地归降。
旦长史李公淹及大唐使人魏徵等说旦及齐善行，令矩归顺。旦等从之，乃令矩与徵、公淹领旦及八玺，举山东之地归降。
Cao Dan's chief clerk Li Gongyan and the Tang envoy Wei Zheng and others persuaded Cao Dan and Qi Shanxing to let Pei Ju submit to the Tang Dynasty. Cao Dan and the others agreed and sent Pei Ju, Wei Zheng, and Li Gongyan to take Cao Dan and all of the seals and surrender the land in Shandong.