《资治通鉴·晋纪·晋纪三十九》
西秦王乞伏炽磐派遣使节前来拜见东晋太尉刘裕，请求进攻后秦，主动为刘裕效力。
西秦王炽磐遣使诣太尉裕，求击秦以自效。
King of Western Qin, Kěfú Chìpán, dispatched an envoy to pay a visit to the Grand Tutor of Eastern Jin, Liu Yu, and requested to attack Later Qin and proactively serve under Liu Yu.