《资治通鉴·唐纪·唐纪三十》
二月甲寅，玄宗于朝堂宴请新任命的县令，玄宗作了一篇文章名《令长新戒》，赏赐给各地的县令。
二月，甲寅，宴新除县令于朝堂，上作《令长新戒》一篇，赐天下县令。
On the jia寅 day in February, Emperor Xuanzong hosted a banquet for newly-appointed county magistrates in the imperial court. Emperor Xuanzong wrote an essay entitled 'An Admonition for New Magistrates' and awarded it to the county magistrates of various regions.