《礼记·文王世子》
秋冬在警宗学礼，由主管礼的官员来教。冬季读《尚书》，由精通《尚书》的官员来教。
瞽宗秋学礼，执礼者诏之；冬读书，典书者诏之。
In autumn and winter, rituals are learned in Jingzong, taught by officials in charge of rituals. In winter, the "Book of History" is read, taught by officials well-versed in the "Book of History".