《明史·志·卷三十二》
凡是官员办公的座席，洪武二十年制定礼仪，大小衙门官员，每天入办公座席行恭敬拱手礼。
凡官员公座，洪武二十年定，大小衙门官员，每日公座行肃揖礼。
Whenever officials worked in their seats, according to the etiquette established in the 20th year of the Hongwu era, officials of all sizes and departments would bow respectfully with their hands clasped upon entering the office each day.