《仪礼·士昏礼》
到庙门前，相揖而入，如此三揖，到达堂下阶前。
至于庙门，揖入。三揖，至于阶，三让。
When they got to the temple gate, they bowed to each other and entered the room. They bowed three times like this and went up to the stairs in front of the hall.