《新唐书·列传·卷一百二十七》
安禄山反叛，派张通儒劫持百官置于洛阳，贼任郑虔伪职为水部郎中，因自称有风疾而未到任，要求为代理市令，暗中以秘密奏章送达灵武。
安禄山反，遣张通儒劫百官置东都，伪授虔水部郎中，因称风缓，求摄市令，潜以密章达灵武。
When An Lushan rebelled, he sent Zhang Tongru to capture the hundred officials and bring them to Luoyang. The rebels forced Zheng Qian to take up the false post of water department minister. Zheng Qian claimed to be suffering from beriberi and did not report for duty. Instead, he asked to be the acting mayor and secretly sent a confidential memorial to Lingwu.