《汉书·纪·宣帝纪》
免除高祖皇帝功臣绛侯周勃等一百三十六家的嫡长子孙的赋役，让他们以此来供奉家庙祭祀，世世都不得间断。
复高皇帝功臣绛侯周勃等百三十六人家子孙，令奉祭祀，世世勿绝。
The eldest sons and direct descendants of 136 high-ranking officials of the previous emperor, such as Jiang Hou Zhou Bo, were exempted from serving the government. Their duty was to conduct temple ceremonies and sacrifices for their family, which could not be interrupted from generation to generation.