《新五代史·列传·杂传第四十》
议事的人举报宋颜藏在李守贞那里，下诏书捉拿宋颜杀掉，李守贞大怒，于是和桑维翰产生矛盾。
言事者告颜匿守贞所，诏取颜杀之，守贞大怒，乃与维翰有隙。
People who were discussing matters reported that Song Yan was hiding in Li Shouzhen's residence, so an imperial edict was issued to arrest and execute Song Yan. Li Shouzhen was furious and thus came into conflict with Sang Weihan.