《旧唐书·本纪·卷十九》
六月，义成军节度使、检校工部尚书杜蝕上奏说：所管辖的颍州僧、道、百姓挽留刺史宗回。敕令说 ：宗回治理百姓公正干练，任期自有时限，正要借助他，使地方安定和睦，还没有考虑替换他。 
六月，义成军节度使、检校工部尚书杜慆奏：当管颍州僧道百姓举留刺史宗回，敕曰： 回清干临人，自有月限，方藉绥辑，未议替移。 
In the 6th lunar month, Du Shi, the military governor of Yicheng, and the acting minister of the ministry of industry, submitted a memorial, saying: the monks, priests, and common people under his jurisdiction wanted to keep Zong Hui as prefect. A decree was issued saying: Zong Hui governs the people in a fair and capable manner, and his term of office has its own time limit; we must rely on him to make the region peaceful and harmonious, and there has been no consideration given to replacing him.