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Since ancient times first, laba is used to worship our ancestors and gods (including the goalkeeper, door god, house, kitchen, JingShen) sacrifice ceremony, praying for harvest and good luck., according to the si ji jiao, features "records, la is the" age of December, and get together to share everything without cable also."Dynasty called LaRi jia ping, shang dynasty to the qing si ", the zhou dynasty as the "big wax";Because the held in December said the month for the twelfth month, called the Greek festival this day LaRi.LaRi of pre-qin period after the winter solstice of the third day of the Buddhism was introduced later, at home in order to expand the influence by lines of traditional culture on the laba festival as the Buddha into way.Buddhism prevailed, followed the Buddha into day and LaRi fusion, known as a magic weapon "festival" in the field of Buddhism.Northern and southern dynasties began to fixed in the day.

According to the load: "three xu-gou after the winter solstice day god Greek festival."Visible, the third xu-gou days after the winter solstice was LaRi.Since Buddhism after intervention, LaRi change on December 8, since xiangyan into the vulgar.

自先上古起，腊八是用来祭祀祖先和神灵(包括门神、户神、宅神、灶神、井神)的祭祀仪式，祈求丰收和吉祥。据《祀记·郊特牲》记载，腊祭是“岁十二月，合聚万物而索飨之也。”夏代称腊日为“嘉平”，商代为“清祀”，周代为“大蜡”;因在十二月举行，故称该月为腊月，称腊祭这一天为腊日。先秦的腊日在冬至后的第三个戌日，后来佛教传入，为了扩大在本土的影响力逐附会传统文化把腊八节定为佛成道日。后随佛教盛行，佛祖成道日与腊日融合，在佛教领域被称为“法宝节”。南北朝开始才固定在腊月初八。

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《说文》载：“冬至后三戌日腊祭百神。”可见，冬至后第三个戌日曾是腊日。后由于佛教介入，腊日改在十二月初八，自此相沿成俗。