《资治通鉴·唐纪·唐纪二十六》
幽州大都督薛讷镇守幽州二十余年，当地吏民安居乐业，薛讷从未发兵出塞寻衅，胡虏也不敢入关进犯。
幽州大都督薛讷镇幽州二十馀年，吏民安之。未尝举兵出塞，虏亦不敢犯。
Xue Na, the grand governor of Youzhou, guarded Youzhou for more than twenty years. Local government officials and civilians stayed where they were and enjoyed their careers. Xue Na never sent out soldiers to create trouble outside the border, and the barbarians dared not enter the gate to commit crimes.