《旧唐书·本纪·卷十五》
九月十七日，诏令： 将死囚减免死罪派去戍守边境是前代的善政，酌量其戍边的远近以施行，也有好处。
丙寅，诏： 减死戍边，前代美政，量其远迩，亦有便宜。
On the seventeenth day of the ninth month of the lunar calendar, an imperial edict was issued: Exempting death row prisoners from execution and sending them to guard the borders were good policies of previous generations. It would be beneficial to implement these policies based on the distance to the border.