《旧唐书·列传·卷四十八》
正碰上安西副都护郭虔馞和西突厥可汗史献、镇守使刘遐庆等不和，互相上奏指责。朝廷令杜暹查其实际情况。
会安西副都护郭虔瓘与西突厥可汗史献、镇守使刘遐庆等不叶，更相执奏，诏暹按其事实。
He happened to come across the discord between Guo Qianyu, the deputy governor of Anxi, and Shi Xian, the Khan of the Western Turks, and Liu Xiaqing, the governor, who accused each other in the memorial. The imperial court ordered Du Xian to investigate the facts.