《资治通鉴·唐纪·唐纪三十五》
肃宗派宦官将军曹日升往南阳宣慰士卒，因为叛军包围，不得入城。
上遣宦官将军曹日升往宣慰，围急，不得入。
Emperor Suzong sent eunuch general Cao Risheng to Nanyang to convey an imperial order to encourage the soldiers, but due to the rebel siege, Cao could not enter the city.