《资治通鉴·唐纪·唐纪七十》
因此将酒滴洒于地而起盟，誓言忠于唐朝而扫平寇难。这天晚上，杨复光派遣其养子在驿馆将黄巢派来的使者杀死。
因沥酒为盟。是夕，复光遣其养子守亮杀贼使者于驿。
So he poured wine on the ground and made an oath, vowing to be loyal to the Tang Dynasty and to eliminate the bandits. That night, Yang Fuguan sent his adopted son to kill the messenger sent by Huang Chao at the guesthouse.