《汉书·传·匈奴传上》
汉朝与匈奴是势均力敌的邻国，匈奴在北方居住，天气寒冷，冬天来得早，所以我命令我的官吏每年送给单于一定数量的秫蘖、金帛、棉布等其他物品。
汉与匈奴邻敌之国，匈奴处北地，寒，杀气早降，故诏吏遗单于秫蘖金帛绵絮它物岁有数。
The Han Dynasty and the Xiongnu were neighboring countries with equal strength. The Xiongnu lived in the north, where the weather was cold and winter came early, so I ordered my officials to send a certain amount of suzhu, gold, silk, cotton, and other items to Shan Yu every year.