The Epistle of Jude is the penultimate book of the New Testament as well as the Christian Bible. It is traditionally attributed to Jude the Apostle, brother of James the Just.
Jude is a short epistle written in Koine Greek. It condemns in fierce terms certain people the author sees as a threat to the early Christian community, but describes these opponents only vaguely. According to Jude, these opponents are within the Christian community, but are not true Christians: they are scoffers, false teachers, malcontents, given to their lusts, and so on. The epistle reassures its readers that these people will soon be judged by God. It is possible that the group being referred to would have been obvious to the original recipients of the letter, but if a specific group was being referred to, knowledge of the details has since been lost. The one bit of their potential ideology discussed in the letter is that these opponents denigrate angels and their role. If this was indeed a part of the ideology of this group the author opposed, then the epistle is possibly a counterpoint to the Epistle to the Colossians. Colossians condemns those who give angels undue prominence and worship them; this implies the two letters might be part of an early Christian debate on Christian angelology.