In the Bible
In the Septuagint (an ancient translation of the Hebrew Bible into Greek), the Greek term ᾅδης (Hades) is used to translate the Hebrew term שאול (Isaiah 38:18.
This is a folk-art allegorical map based on Matthew 7:13–14 Bible Gateway by the woodcutter Georgin François in 1825.
In Acts 2:27 as "οὐκ ἐγκαταλείψεις τὴν ψυχήν μου εἰς ᾅδου" (you will not abandon my soul to Hades).
In the Textus Receptus version of the New Testament, on which the English King James Version is based, the word "ᾅδης" (Hades), appears 11 times; but critical editions of the text of 1 Corinthians 15:55 have "θάνατος" (death) in place of "ᾅδης". Except in this verse of 1 Corinthians, where it uses "grave", the King James Version translates "ᾅδης" as "hell". Modern translations, for which there are only 10 instances of the word "ᾅδης" in the New Testament, generally transliterate it as "Hades".
In all appearances but one, "ᾅδης" has little if any relation to afterlife rewards or punishments. The one exception is Luke's parable of Lazarus and the rich man, in which the rich man finds himself, after death, in Hades, and "in anguish in this flame", while in contrast the angels take Lazarus to "the bosom of Abraham", described as a state of comfort.
Death and Hades are repeatedly associated in the Book of Revelation. The word "Hades" appears in Jesus' promise to Peter: "And I also say unto thee, that thou art Peter, and upon this rock I will build my church; and the gates of Hades shall not prevail against it", and in the warning to Capernaum: "And thou, Capernaum, shalt thou be exalted unto heaven? thou shalt go down unto Hades."