The Book of the Dead, more accurately titled the Book of Coming Forth by Day in ancient Egyptian, is a collection of funerary spells assembled from earlier Pyramid and Coffin Text material alongside newly composed New Kingdom content, individually customized and copied onto papyrus scrolls for private burial with the deceased to guide them safely through the dangers of the underworld toward a favorable afterlife judgment. Its most famous section, the weighing of the heart ceremony, describes the deceased's heart being weighed against Maat's feather of truth before the god Osiris and forty-two assessor deities, with a favorable outcome granting entry into the fields of Aaru, a paradisiacal afterlife realm, while failure meant consumption by the monstrous devourer Ammit, a moral and theological framework combining Egyptian conceptions of ethical judgment with elaborate ritual magic intended to ensure the desired outcome regardless of the deceased's actual conduct in life. Late Egyptian's role as the living vernacular during this period meant scribes producing Book of the Dead copies for paying clients could draw on contemporary spoken idiom alongside inherited archaic formulas from earlier Middle Egyptian funerary tradition.