《资治通鉴·唐纪·唐纪三十三》
于是封常清就亲自骑马入朝报告，到了渭南，玄宗下敕书剥夺了他的官职和爵位，让他回到高仙芝的军中作为一名普通的士卒去效命。
常清乃自驰诣阙，至渭南，敕削其官爵，令还仙芝军，白衣自效。
So Feng Changqing rode into the court in person to report, and when he arrived in Weinan, Emperor Xuanzong issued an imperial edict to strip him of his official positions and titles, and ordered him to return to Gao Xianzhi's army as an ordinary soldier.