《太平广记·卷二百五十九·嗤鄙二》
怀贞不知道他与宗楚客的关系，便高高拱手为礼道：宗楚客可能要背离朝廷，你应该作些查核。袁守一立刻将此事检举。
怀贞未之知也。贞高揖曰：驾欲出，公作如此检校。
Huaizhen did not know about his relationship with Zong Chuke, so he clasped his hands in salute and said, "Zong Chuke is likely to rebel against the court and you should investigate him." Yuan Shouyi reported it immediately.