Why do Cao'e people eat moxa dumplings during Qingming Festival?

Cao E was born in Caojiabao, Zaohu Township, Shangyu. His father, Cao Xu, was a witch who could "melody the festival with songs and play music to the gods." On May 5, the second year of Han'an in the Eastern Han Dynasty (143), Cao Xu sailed a boat to meet the tide god Wu Jun in the Shun River, "for the water." He was drowned and his body was not found. In the fourteenth year of E's life, he threw a melon into the river and saved his father's body. He died and carried his father's body out three days later. "The original text is in front of it, and the translation is: "Cao E's father drowned in the river, and his body was not seen for several days. The filial daughter Cao E, who was only fourteen years old at the time, went along the river day and night to find her father. Seventeen days later, on May 5th, she also threw herself into the river, and three days later she took out her father's body." In order to commemorate her, later generations changed the name of Shun River to Cao E River. In the first year of Yuanjia (151), Du Shang, the official of Shangyu County, buried E next to Jiangnan Road. He ordered his disciple Handan Chun to write an inscription, carve a stone and erect a stele to honor her filial piety. Later, Cai Yong visited him at dusk. He touched the text and read it, and wrote eight characters on the back of the stele: "Yellow Silk Young Woman's Grandson Junjiu" (it is a riddle, and the answer is a wonderful word). When talking about Cao E's monument, we have to mention Yang Xiu and Cao Cao. Back then, Cao Cao and Yang Xiu were riding horses. When passing by Cao E's monument, they saw the eight words "Yellow Silk Young Woman's Grandson Junjiu" engraved on the underside of the monument. Cao Cao Ask Yang Xiu if he understands the meaning of these eight words? Yang Xiu was about to answer, but Cao Cao said, "Don't say it yet, let me think about it." After walking thirty miles, Cao Cao said, "I already understand the meaning of those eight words. Tell me yours." Understand, see if we have the same view. "Yang Xiu said: "Yellow silk is the color of silk, and it is perfect; a young woman is a girl, and it is better to be together; a grandson is a daughter's son, and it is better to be together; "Jiu" means "suffering", which means "ci". These eight words are "excellent words" and are a tribute to the inscription on Cao E's stele. "Shangyu County Chronicles: Du Shang's Biography" records that Shang began to build the Cao'e Temple in the first year of Yuanjia. Feudal emperors of all dynasties publicized Cao E's great achievements and awarded them with plaques. In the fourth year of Daguan in the Song Dynasty (1110), she was granted the title of Mrs. Lingxiao; in the fifth year of Zhenghe (1115), she was granted the title of Zhaoshun; in the sixth year of Chunyou (1246), she was granted the title of Chunyi; in the fifth year of the Yuan Dynasty (1339), she was granted the title of Mrs. Huigan. In the eighth year of Hongwu's reign in the Ming Dynasty (1375), officials were ordered to pay homage to the emperor, but Liu Ji wrote an inscription because of his sincerity. In the 13th year of the Jiaqing reign of the Qing Dynasty (1808), she was granted the title of Mrs. Fuying; in the 4th year of Tongzhi (1865), she was granted the title of Mrs. Inspiration and the plaque "Fu Bei Cao Jiang" was given. During the Republic of China, important military and political officials such as Chiang Kai-shek, Lin Sen, Xiong Xiling, and Yu Youren all had plaques and couplets inscribed as gifts. Chiang's inscription was: "Light of Human Relations." At its peak, there were 170 plaques and 57 couplets. Cao'e Temple was built during the Eastern Han Dynasty. Since then, it has been destroyed and rebuilt several times. It was renovated and opened in 1985 and is known as the "No. 1 Temple in Jiangnan". The famous stele of Cao E in the Eastern Han Dynasty has been lost. Today, the stele of the Song Dynasty is preserved. It was copied and reprinted by the calligrapher Cai Bian in the eighth year of Yuanyou (1093). The tomb of the filial daughter Cao E is located in Shaoxing, Zhejiang Province today. It is later said that the stele of Cao E was written by King Yi of the Jin Dynasty. In order to commemorate Cao E's filial piety, later generations built the Cao E temple at the place where Cao E threw herself into the river. The village and town where she lived was renamed Cao E town, and the place where Cao E died for her father was named Cao E river.