What is the origin of Tomb-Sweeping Day?

The origin of Tomb-Sweeping Day is related to commemorative meson push;

According to legend, in the Spring and Autumn Period and the Warring States Period, Jin Xiangong's concubine killed the prince in order to let her son inherit the throne, and Shen Sheng was forced to commit suicide. Shen Sheng's younger brother, Zhong Er, went into exile to escape the scourge. During his exile, Zhong Er suffered humiliation. Most of the courtiers who went out with him went out one after another. Only a few loyal people have been following him. One of them is called meson push. On one occasion, Zhong Er fainted from hunger. In order to save Zhong Er, Jiezitui cut a piece of meat from his leg, cooked it with fire and gave it to Zhong Er. Nineteen years later, Zhong Er returned to China and became the monarch, that is, Jin Wengong, one of the famous five tyrants in the Spring and Autumn Period.

After Jin Wengong came to power, in addition to meson push, he offered many rewards to courtiers who shared his joys and sorrows. Someone defended meson in front of Jin Wengong. Jin Wengong suddenly remembered the past and felt guilty. He immediately sent someone to ask meson to take the imperial court to be rewarded as an official. However, after several trips, the meson could not be pushed. Jin Wengong had to please. However, when Jin Wengong came to the meson pusher's house, he saw that the door was closed. Jiezitui didn't want to see him, and had already been hiding in Mianshan (now southeast of Jiexiu County, Shanxi Province) behind his mother's back. Jin Wengong asked his body guard to search Mianshan, but he couldn't find it. So, someone had an idea, saying, it is better to let Yamakaji go, set fire on three sides, leave one side, burn it and the meson will come out. Jin Wengong ordered the promotion of Yamakaji. Unexpectedly, the fire burned for three days and nights. After the fire was put out, the meson was not pushed out after all. Looking up the mountain, the mother and son were holding a charred willow tree and were dead. Jin Wengong looked at meson push's body and cried for a while. Then I buried the body and found that the back of meson push was blocked by a willow hole, as if there was something. Take out a look, turned out to be a skirt, with a blood poem:

I hope your master is always clear.

It is better to be a ghost than to accompany you as an exhorter.

If your master has me in his heart, remember that I often reflect.

I have a clear conscience in Jiuquan, diligent and honest.

Jin Wengong hid the bloody book in his sleeve. Then meson tui and his mother were buried under the charred willow tree. To commemorate Jiexiu, Jin Wengong ordered Mianshan to be changed to Jiexiu Mountain, and an ancestral temple was built on the mountain, and the day when Yamakaji was released was designated as the Cold Food Festival, telling the whole country that it is forbidden to set off fireworks and firecrackers on this day every year and only eat cold food.

When he left, he cut a charred willow and made a pair of clogs in the palace. He looked at it every day and sighed, "What a pity." The "first step" is the name of ancient people's subordinates respecting each other between superiors or peers, which is said to come from it.

The following year, Jin Wengong led his ministers to go hiking in plain clothes to show their respect and condolences. Walking to the grave, I saw the dead old willow tree resurrected, with thousands of green branches dancing in the wind. Jin Wengong looked at the resurrected old willow tree and seemed to see the meson push. He walked up to him respectfully, lovingly squeezed a branch, braided it into a circle and put it on his head. After the sacrifice, Jin Wengong named the revived old willow "Qingming Willow" and named it Tomb-Sweeping Day.

Later, Jin Wengong often took a bloody book with him as a souvenir, urging himself to take power. He is diligent and honest, and strives to govern the country well.

Since then, the people of Jin have been able to live and work in peace and contentment, and they are very nostalgic for Jietui, who has made outstanding contributions and is not looking for wealth. On the day of his death, it is forbidden to set off fireworks in memory of him. It is also made of flour and jujube paste into the shape of a swallow, strung with willows and inserted in the door to summon his soul. This thing is called "pushing swallows" (also called intermediary pushing). Since then, cold food and Qingming have become grand festivals for the people of the whole country. Whenever there is cold food, people don't make a fire to cook, but only eat cold food. In the north, people only eat cold food prepared in advance, such as jujube cakes and wheat cakes. In the south, there are mostly green balls and glutinous rice and sugar lotus roots. Every time I go to Tomb-Sweeping Day, people put wicker in a circle and put wicker branches in front of the house to show their memory.