Proclamations and Conversions Discussed Only in Epistles: Jude
Jude is a short letter written to an unspecified group of Christians. His purpose is to urge his readers to be true to the faith that they originally were taught compared to false teachers who were warping the grace of God and the nature of Jesus. The bulk of his letter is an exposé and condemnation of these false teachers.
 
Text Observations
JUDE 1:3 Beloved, while I was making every effort to write you about our common salvation, I felt the necessity to write to you appealing that you contend earnestly for the faith which was once for all delivered to the saints.  Though not specifically discussing the content of the orginal message, Jude wants is readers to not deviate from what they were originally taught.
JUDE 1:4 For certain persons have crept in unnoticed, those who were long beforehand marked out for this condemnation, ungodly persons who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ. The false teachings here are 1) warping God's grace into a license to sin, and 2) denying Jesus Christ (probably denying his human nature). 

Thus, the gospel message probably contains true teaching about these things: Grace (such an emphasis that it could be warped into license), and that Jesus Christ is the Son of God.
JUDE 1:17 But you, beloved, ought to remember the words that were spoken beforehand by the apostles of our Lord Jesus Christ, [18] that they were saying to you, "In the last time there shall be mockers, following after their own ungodly lusts."  Whether this apostolic testimony was part of the original proclamation of the gospel or a subsequent instruction is not known. But the warning is true enough: there will always be plenty of false teachers who mock the truth.

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