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New Testament

The author calls himself the brother of James, but not an apostle. He is not, therefore, one of the twelve Judas, also known by the surname Thaddaeus or Leviticus, but one of the supposed brothers of the Lord, that is, one of the sons whom Joseph had obtained from a woman with whom he had been married before he was betrothed to the Theotokos. Given that he would have been at least five years older than the Lord, we may conclude from this that the letter was written around 70 AD.
As for the occasion on which this was written, and its purpose, we may assume that the news was conveyed to Jerusalem by some believers in Syria, particularly of the Church of Antioch, that false teachers were causing great corruption among Christians through their erroneous teachings. So Jude, who as one of the old elders of the Church of Jerusalem enjoyed, after the death of his brother James, a special prestige in the Church, writes the letter with the aim of emphasizing to the believers the threatened danger and of recommending to them persistence in the life of purity and true faith.
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NKJV translation
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