《礼记·乡饮酒义》
到了主人门外，主人向宾行拜礼，向介行拜礼；至于众宾，主人不拜，只是作一个揖，就请他们进来了。
至于门外，主人拜宾及介，而众宾自入；贵贱之义别矣。
After arriving at the host’s gate, the host bowed ceremoniously to the guest and made a semiceremonial bow to the introducer;至於 the other guests, the host did not bow, but simply made a gesture of greeting and invited them to enter.