簡介：唐tang僧seng師shi徒tu四si人ren前qian去qu西xi天tian取qu經jing
，途tu經jing荒huang山shan野ye嶺ling
，巧qiao遇yu一yi位wei破po衣yi爛lan衫shan和he尚shang
，要yao他ta們men師shi徒tu捎shao帶dai一yi些xie羊yang皮pi背bei囊nang交jiao與yu如ru來lai佛fo祖zu。此ci背bei囊nang所suo裝zhuang之zhi物wu，謂wei“有you即ji是shi無wu，無wu即ji是shi有you，隻zhi要yao你ni心xin中zhong想xiang要yao什shen麼me
，就jiu會hui有you什shen麼me，實shi為wei一yi件jian非fei常chang神shen奇qi的de法fa寶bao。但dan和he尚shang要yao唐tang僧seng師shi徒tu下xia以yi誠cheng信xin保bao證zheng

，就jiu是shi在zai把ba背bei囊nang交jiao給gei如ru來lai佛fo祖zu之zhi前qian

，無wu論lun遇yu到dao什shen麼me，都dou不bu許xu打da開kai，更geng不bu能neng盜dao用yong囊nang中zhong之zhi物wu。唐tang僧seng師shi徒tu一yi口kou應ying承cheng。臨lin走zou前qian
，和he尚shang把ba用yong來lai打da開kai背bei囊nang的de口kou訣jue分fen三san句ju分fen別bie告gao訴su孫sun悟wu空kong、豬(zhu)八(ba)戒(jie)和(he)沙(sha)和(he)尚(shang)。師(shi)徒(tu)一(yi)行(xing)重(zhong)又(you)上(shang)路(lu)。小(xiao)牛(niu)王(wang)得(de)知(zhi)此(ci)事(shi)，對(dui)背(bei)囊(nang)垂(chui)涎(xian)欲(yu)滴(di)
，召(zhao)集(ji)天(tian)神(shen)天(tian)將(jiang)後(hou)代(dai)，執(zhi)意(yi)占(zhan)為(wei)已(yi)有(you)。小(xiao)牛(niu)王(wang)乃(nai)牛(niu)魔(mo)王(wang)和(he)鐵(tie)扇(shan)公(gong)主(zhu)的(de)嬌(jiao)養(yang)獨(du)子(zi)………