《新五代史·本纪·晋本纪第八》
而且太原地险粮多，我如果传檄诸镇，外求援于契丹，能成功吗？ 
且太原地险而粟多，吾当内檄诸镇，外求援于契丹，可乎？ 
Moreover, Taiyuan has a dangerous location and plenty of food. If I send out urgent letters to other towns and ask for help from Khitan, can I succeed?