《礼记·文王世子》
凡是祭祀、养老乞言和合语的礼节，都由小乐正在东序教太子及太学生。
凡祭与养老，乞言，合语之礼，皆小乐正诏之于东序。
All the rituals of sacrifice, asking the elderly for advice, and polite speech are taught to the crown prince and the students by Xiao Lezheng in the east wing.