《宋书·本纪·卷三》
置氐的封爵，都随国运改变，军于道德与卓绝人物相同，救济民众者，怀念行仁政者之树尚且不伐，即使朝代不同，按理不应泯灭。
晋氏封爵，咸随运改，至于德参微管，勋济苍生，爱人怀树，犹或勿翦，虽在异代，义无泯绝。
The rank that the Di were enfeoffed with changed as the fortune of the country changed, but the treatment of military and moral excellence and outstanding people was the same; and the trees planted in memory of those who relieved the people and thoughts of their good government were not cut down, so that even though the dynasty had changed, it was not right that they should be eliminated.