《北史·列传·卷七十六》
过去商山四老，轻易兴举汉室，淮南八公，来到藩臣官邸。
昔商山四皓，轻举汉庭；淮南八公，来仪籓邸。
In the past, the four elders of Shang Mountain easily helped the Han Dynasty. The eight dukes of Huainan came to the vassal ministers' mansions.