《后汉书·列传·循吏列传》
建武十三年，外国献来名马，一日跑千里，又进献宝剑，其价值可抵得上百斤黄金。诏命以马驾拉鼓的车，将宝剑赐给骑士。
建武十三年，异国有献名马者，日行千里，又进宝剑，贾兼百金，诏以马驾鼓车，剑赐骑士。
In the 13th year of Jianwu, foreign countries presented famous horses that could run a thousand miles a day, and they also presented precious swords that were worth a hundred pounds of gold. The emperor ordered the horse to be yoked to a chariot to carry a drum, and the sword should be given to the knight.