The man cut his arm after drinking and was bleeding profusely. Why did ancient people become bloody?

I also saw this news, saying that two men in a county of Jilin Province fell in love after drinking and wanted to become sworn brothers of the opposite sex. As a result, because I drank too much, I cut my arm too deep with a knife, resulting in bleeding on both sides. Later, the two older brothers had no choice but to call the police, and then the police found an ambulance to take them to the hospital. Remind everyone here that it is risky to become sworn brothers. It sounds like a joke, but it's true, and everyone can laugh it off, but many people will have a question, why did the ancients have to bleed to become allies? We often see such a bridge in TV dramas or various film and television works, piercing our fingers or arms, and blood dripping from our arms into the wine. What is this for? Let's solve this puzzle for everyone.

The ancients worshipped blood. In ancient times, people lived together and then formed tribes. Every tribe has its own totem. The ancients regarded these totems as sacred objects, and these sacred objects were of course bloody, so the ancients regarded the bloody species as mysterious and worshipped blood, so they later evolved into you. If I want to be sworn brothers of the opposite sex, I must bleed, which shows that I attach importance to this matter.

Since blood relationship is to be brothers of the opposite sex, just like Liu Taoyuan's three vows, you and I have no blood relationship at all, so after the blood alliance ceremony, that is, you have my blood in your body and I have your blood in my body, the three of us have a connection in blood, which is also a main reason for the ancients to become sworn.

To test whether the other party is really angry, parents can't be hurt, just to be filial. This is a sentence in the Book of Filial Piety, which also shows how much ancient people valued their bodies. But in order to become sworn with you, I did not hesitate to hurt my body and let my body bleed, which shows that I really want to treat you as a brother, so I bled for the alliance to test whether the other party is sincere.