《资治通鉴·唐纪·唐纪二十五》
以前吐蕃在无恩于大唐时，尚且想索取突厥十姓和安西四镇之地；如果现在帮助大唐攻破娑葛有功，吐蕃就会请求朝廷将于阗、疏勒二镇割让给它，到那时不知朝廷能以什么理由抑制这一要求！
往年吐蕃无恩于中国，犹欲求十姓、四镇之地；今若破娑葛有功，请分于阗、疏勒，不知以何理抑之！
"Previously when Tubo did not receive any favors from the Great Tang, they still planned to take over the region where the Ten Clans of Turks lived and the four garrisons of Anxi; if they now aid the Great Tang in capturing Shege and are successful, Tubo will request that the court cede the two garrisons of Yutian and Shule to them. At that time, who knows what reason the court can use to suppress the request!