张天师是东汉五斗米道的创立者，教人信奉道教。他用“符水咒法”给人治病，后世道徒尊其为天师。传说张天师神通广大，有龙虎护法能除五毒并辟瘟消灾，随着这样的传说流传渐广，宋代时便出现了挂张天师像的习俗，来祛邪除恶、镇宅佑安。
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