《资治通鉴·唐纪·唐纪十九》
隋朝末年祸乱，将当地百姓迁移到宁、庆二州，致使胡寇深入，以灵、夏二州为边境；贞观末年，招募人民充实丰州，西北才获得安宁。
隋季丧乱，迁百姓于宁、庆二州，致胡虏深侵，以灵、夏为边境。贞观之末，募人实之，西北始安。
Due to the chaos at the end of the Sui Dynasty, local residents were moved to Ningzhou and Qingzhou, which resulted in enemy troops going deep into our territory and using Lingzhou and Xiazhou as their borders. At the end of the reign of Emperor Taizong, the people were recruited to strengthen Fengzhou, which brought peace to the northwest.