Jude 1:17-25 KJV
17But, beloved, remember ye the words which were spoken before of the apostles of our Lord Jesus Christ;
18How that they told you there should be mockers in the last time, who should walk after their own ungodly lusts.
19These be they who separate themselves, sensual, having not the Spirit. 20But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,
21Keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life. 22And of some have compassion, making a difference: 23And others save with fear, pulling them out of the fire; hating even the garment spotted by the flesh.
24 Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy,
25 To the only wise God our Saviour, be glory and majesty, dominion and power, both now and ever. Amen.

Introduction
This letter is written by Jude and it is not clear if he is the brother of Jesus or not but he calls himself the brother of James, and a servant of Jesus Christ( Jude1). When you look at both letters you can see similarities between the writings of James and Jude so it is possible that they are brothers The suggestion when the letter is written is in about 60 and 70A.D.
Background
If Jude is Jesus’ brother he came to believe in him as his saviour. In John 7:5 it is written that Jesus’ own brothers didn't believe in him. In the letter the author sees Jesus as the Messiah, and he wants to share that knowledge with us. But he also realizes that following Jesus has a price and that it is a daily battle. When we are taking the cross up daily the devil will attack us and the author wants us to learn that sometimes the hardest attacks are coming from the inside of the church. The audience of this letter could be Jewish Christians and all followers of Jesus.
Context
>Before the passage
Jude starts by introducing himself. He then tells them what his view point is and what he knows about those people he is writing his letter to. He writes them that they have false teachings around them and explaining that through the Old Testament (Jude11 Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core. Jude 1:11 (KJV)). >After the passage
He writes the Doxology, the end of the letter, and the final commendation and accepting of praise.
And the book of Revelation follows.
>Integration of the Passage
The passage is about a call to persevere.
The author is describing to his readers what God wants them to do instead following the false teachers.

General theme (s)
Abiding in God
Teaching point 1: Staying in the word
Vers 17But, beloved, remembers ye the words which were spoken before of the apostles of our Lord Jesus Christ;

Explain Teaching Point
These people Jude is writing to must have been taught from other Apostles beforehand, and Jude encourages them now to remember what the Apostles have said and what they have learned. We see a similar calling to stay in the word in 2 Timothy 3:14-17 KJV
But continue thou in the things which thou hast learned and.... thou hast known the holy scriptures, ....All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness .....

It is not only a calling to stay in these things we have learned already but to learn more. Paul says "...All the scriptures are given..., for doctrine..." Paul tells Timothy he should stay in the word, in the scripture which were given already in the Old Testament and in what he learned from the Apostles about Jesus in the New Testament

2 Peter 3:2 KJV That ye may be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Saviour:
1 Peter 1:25 KJV And this is the word which by the