《新唐书·列传·卷一百四十六》
三年人民大相聚一次，杀牛羊祭天，从别的国家取麦子酿酒。
三年一相聚，杀牛羊祭天，取麦他国以酿酒。
The people gathered together once every three years to sacrifice cattle and sheep to heaven, and to brew alcohol from grains taken from other countries.