This chapter describes the surprising motif found in early medieval rabbinic traditions that appears in some manuscripts of the Babylonian Talmud and concerns the sacrifice of 'the souls of the righteous' upon the heavenly altar. It compares the motif, background, and transmission of medieval rabbinic traditions with other traditions concerning the 'souls of the righteous' in rabbinic literature and with precedents in texts of the Second Temple period. The chapter outlines early Enochic traditions, apocalyptic texts of the Second Temple period, and early Christian cultural traditions and beliefs. It indicates the nexus between Christian and Byzantine Jewish traditions, which became manifest in the development of motifs and textual sources during the first centuries of the Common Era and later expressed in medieval Ashkenazi texts. It also provides evidence on cultural transmission between Byzantine works, traditions of the East, and the cultural milieu of medieval Ashkenaz.