▁of ▁the ▁or atorio ▁appears ▁to ▁be ▁an ▁original ▁composition ▁by ▁Bach . ▁It ▁is ▁mentioned ▁as ▁such ▁in ▁the ▁last ▁volume ▁of ▁Johannes ▁Z ahn ' s ▁, ▁as ▁first ▁of ▁four ▁late ▁add itions ▁to ▁his ▁catalog ue ▁of ▁German ▁Evangel ical ▁h ymn ▁t unes . ▁There ▁are ▁very ▁few ▁known ▁h ymn ▁t unes ▁by ▁Bach ▁( he ▁used ▁Luther an ▁h ymn ▁t unes ▁in ▁the ▁large ▁majority ▁of ▁his ▁sacred ▁compos itions , ▁but ▁rarely ▁one ▁of ▁his ▁own ▁in vention ): ▁apart ▁from ▁what ▁can ▁be ▁found ▁in ▁the ▁Christmas ▁Or atorio , ▁there ▁appears ▁to ▁be ▁one , ▁partly ▁inspired ▁by ▁a ▁pre - ex isting ▁mel ody , ▁in ▁the ▁mot et ▁Komm , ▁Jes u , ▁komm , ▁B W V   2 2 9 ▁( com posed ▁before ▁ 1 7 3 1 – 3 2 ), ▁and ▁at ▁least ▁one ▁entirely ▁by ▁Bach , ▁" Ver g iss ▁me in ▁nicht , ▁verg iss ▁me in ▁nicht ", ▁B W V   5 0 5 , ▁in ▁ ▁( pub lished ▁in ▁ 1 7 3 6 ). ▁ ▁G ospel ▁narr ative ▁Like ▁for ▁his ▁other ▁or ator ios , ▁and ▁his ▁Pass ion ▁settings , ▁Bach ▁employed ▁a ▁narr ative ▁based ▁on ▁the ▁G ospel ▁in ▁his ▁Christmas ▁Or atorio . ▁The ▁G ospel ▁narr ative ▁of ▁this ▁or atorio ▁followed , ▁to ▁a ▁certain ▁extent , ▁the ▁respective ▁G ospel ▁read ings ▁of ▁the ▁church ▁services ▁where ▁the