The second death, also known as eternal death, is an eschatological concept in Judaism, Christianity, and Mandaeism related to punishment after a first/initial death on Earth.
Jewish eschatology
Although the term is not found in the Hebrew Bible (the Canonical collection of Hebrew scriptures), Harry Sysling, in his study (1996) of Teḥiyyat ha-metim (Hebrew; "the resurrection of the dead") in the Palestinian Targums, identifies a consistent usage of the term "second death" in texts of the Second Temple period and early rabbinical writings. In most cases, the "second death" is identical with the judgment, following the resurrection, in Gehinnom at the Last Day.
In Targum Neofiti (Neof.) and the fragments (FTP and FTV), on the verse Deutoronomy 33:6, the "second death" is "the death that the wicked die."
Targum Isaiah has three occurrences. The first is 22:14, where the Aramaic paraphrases the Hebrew as "This sin will not be forgiven you until you die the second death."
The final two examples are from Targum Isaiah 65, which sets the scene for an apocalyptic final battle. Targum Isaiah 65:6 paraphrases the Hebrew in line with the interpretation of the penultimate verse of the Hebrew Isaiah found in the Gospel of Mark, where "their worm does not die" is equated with Gehinnom. Here both Targum Isaiah and Gospel of Mark supply the term "Gehinnom", where Hebrew Isaiah simply concludes with the heaps of corpses following the last battle where "their worm does not die", making no further eschatological extension into resurrection and judgment.
Targum Jeremiah 51:17 has the Aramaic "they shall die the second death and not live in the world to come", which appears to depart from the other Targum uses in not being explicit that the second death is resurrection but may instead be an exclusion from resurrection.
The majority reading of Targum Psalm 49:11 has the Aramaic translation "For the wise see that the evil-doers are judged in Gehinnom". However, several manuscripts, including Paris No.10, Montefiore No.