Albert Barnes Commentary Jude 1:17-18

"But ye, beloved, remember ye the words which have been spoken before by the apostles of our Lord Jesus Christ; That they said to you, In the last time there shall be mockers, walking after their own ungodly lusts." — Jude 1:17-18 (ASV)

But, beloved, remember ye, etc. There is a striking similarity between these two verses and 2 Peter 3:1–3. It occurs in the same connection, following the description of the false and dangerous teachers against whom the apostle sought to guard them, and is expressed in almost the same words. See it explained in the Notes on the similar passage in Peter.

When Jude (Jude 1:17) entreats them to remember the words that were spoken by the apostles, it does not necessarily mean that he was not himself an apostle. For he is speaking of what was past, and there might have been a special reason for him to refer to something that they would distinctly remember, which had been spoken by the other apostles on this point. Or it might be that he also meant to include himself among them and to speak of the apostles collectively, without specifically identifying himself.

Mockers. The word rendered mockers here is the same word that in the parallel passage in 2 Peter 3:3 is rendered scoffers. Peter has stated more fully the particular subject of their scoffing and has shown that there was no reason for it (2 Peter 3:4 and following).