First, the custom of avoiding stepping on the threshold began in the pre-Qin period. At that time, courtiers could not step on the threshold when entering and leaving the monarch's portal, but walked sideways. The threshold has the distinction of identity, and this custom in the pre-Qin period represents a kind of etiquette of monarch and minister, which has since evolved into the level of family status.
Second, the threshold has the function of shielding filth and ward off evil spirits. A threshold is placed horizontally at the door, which symbolizes the erection of a wall to keep out all bad things and ensure the safety and happiness of the family.
3. In the past, the wooden Fang on the threshold was made of the same material as the main Fang on the top of the beam, that is, a wooden Fang was divided into the main beam and the threshold. Liang Zheng can "keep the town house safe", and the threshold naturally has this effect.
Fourth, the legendary threshold is that ancestors can't step on their necks, otherwise it is disrespectful.
Another way of saying it is: the threshold is the head and neck of a family, don't step on the threshold, don't sit and fight.
Sixth, it is said that stepping on the threshold will ruin one's feng shui and collide with one's family god (in some areas, folk customs believe that every family has a protector).
Seven, Buddhist temples pay attention to more. Male guests should step into the temple with their left feet first, while female guests should step on the threshold with their right feet first.