《旧唐书·本纪·卷七》
二月二日，皇上驾到玄武门，与近侍之臣观看宫女们大宴饮，不久，又让宫女们分为左右两班，共同来竞争喝酒谁胜谁负。
二月己丑，幸玄武门，与近臣观宫女大酺，既而左右分曹，共争胜负。
On the second day of February, the emperor arrived at Xuanwu Gate, and watched the palace maids drink heavily with his close ministers. Soon, he had the palace maids divided into two teams, left and right, to compete in drinking.