《晋书·志·第九章》
庶人以上的人，没有不是衹行蒸祭尝祭礼的。嫡子在外，就由庶子执行，还没有不是亲身接受丫上天的使命却可以去祭天的人。 
庶人以上，莫不蒸尝，嫡子居外，介子执事，未有不亲受命而可祭天者。 
Among the commoners above the level of shuren (minor official), there was no one who performed any other rituals except the household rituals of offering steamed and burnt food offerings. If the legitimate son is away from home, then the illegitimate son takes over his duties. However, there has never been anyone who was not personally entrusted with the mission by the emperor and was allowed to perform a ritual to worship Heaven.