《资治通鉴·唐纪·唐纪十三》
众位大臣都认为： 陛下刚刚派兵远征辽东，而又将突厥人安置在河南一带，离京师很近，怎么能不成为后患呢？
群臣皆以为： 陛下方远征辽左，而置突厥于河南，距京师不远，岂得不为后虑！
All the ministers believed: Your Majesty has just sent soldiers to expedition to Liaodong and then placed Turkic people in Henan, which is very close to the capital. How could it not become a future trouble?