When he was in trouble, one of his courtiers cut meat to satisfy his hunger. Later, Duke Wen became a bully in the Spring and Autumn Period and lived in seclusion in the mountains, so he didn't want to raise it. When Wen Gong looked for him, he let Yamakaji go, but he would rather die than come out. Later, a poem left by him was found on his dead tree, mainly to persuade Wen Gong to be honest and clean. The last sentence is like this: "Qingming comes again." Therefore, this day was designated as Tomb-Sweeping Day.
Tomb-Sweeping Day, also known as the Walking Festival, is a traditional festival at the turn of mid-spring and late spring in China, and it is also one of the most important festivals to worship ancestors and sweep graves. Tomb-Sweeping Day is a traditional festival of the Chinese nation, which started in the Zhou Dynasty and has a history of more than 2,500 years.
"Almanac": "On the fifteenth day after the vernal equinox, the bucket refers to Ding, which is used for Qingming, when everything is clean and bright, and when it is covered, everything is clean and bright, hence the name." As soon as Qingming arrives, the temperature rises, which is a good time for spring ploughing. Therefore, there is a saying that "melons and beans are planted before and after Qingming".