Jude 1:3-4 - Jude's Purpose In Writing
3 Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, to exhort you, that ye should continually labour in the faith, which was once given unto the saints. 4 For there are certain craftily crept in, of which it was written aforetime unto such judgement. They are ungodly, and turn the grace of our Lord God unto wantonness; And deny God the only Lord, and our Lord Jesus Christ.