《资治通鉴·晋纪·晋纪四十》
刘裕声称讨伐秦，他的真实目的难以猜测；而且秦是与我们有婚姻关系的国家，不可以不出兵相助。
裕声言伐秦，其志难测。且秦，婚姻之国，不可不救也。
Liu Yu claimed to be attacking Qin, but his real purpose is hard to guess; besides, Qin is a country with a marriage relationship with us, and we should send troops to help them.