《礼记·祭统》
谛是阳气最盛的祭，尝是阴气最盛的祭，所以说：没有比筛、尝更重要的。
故曰：莫重于禘、尝。
Di is the sacrifice when the yang energy is at its peak, and Chang is the sacrifice when the yin energy is at its peak, so the saying goes: there is nothing more important than Di and Chang.