In ancient China, it was rare to farm cattle. People who own cattle can be called all property. Raising cattle is very precious. In ancient times, slaughtering cattle at will was even characterized as an illegal act by the imperial court, which was a pain in the flesh and was severely punished by imprisonment. Taoism does not eat beef, which is a continuation of obeying the law and discipline, and the second is a praise for the industrious virtue of cattle.
Extended data:
Taoism not only expressly stipulates various commandments, but also forms unique religious taboos in worship of gods, cultivation of truth, worship of teachers, fasting, worship and diet.
Four don't eat: Taoist priests don't eat four kinds of meat-beef, mullet, swan goose and dog meat, because cattle, mullet, swan goose and dog represent loyalty, filial piety, chastity and righteousness respectively.
Taoism doesn't talk about longevity: Taoism hates death when it is reborn, and it is taboo to ask the age, so it is impolite to ask the elderly to live longer.
Martial arts are not true: Taoism does not burn incense, recite scriptures, worship, build a fast or hold a memorial service on the "martial arts" day of the lunar calendar (Wuzi, Wuxu, Wuyin and Wushen).
Baidu encyclopedia-Taoism