《后汉书·列传·南匈奴列传》
南单于既然归顺汉，就同时祭祀汉皇帝，藉此机会召集各部，商量国家事务，举行赛马和赛骆驼，以此为乐。
南单于既内附，兼祠汉帝，因会诸部议国事，走马及骆驼为乐。
Since the Southern Chanyu had submitted to the Han, he would concurrently offer sacrifices to the Han emperor. He would take this opportunity to gather the various clans and discuss state affairs, and organize horse and camel races for their entertainment.