The apostle Peter declares that the Words (the scriptures) spoken by the holy men of God who are moved by the Holy Spirit, is a MORE SURE WORD OF PROPHECY concerning Jesus, than the disciples hearing the voice of God from heaven.
16 For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
17 For he received from God the Father honour and glory, when there came such A VOICE to him from the excellent glory, This is my beloved Son, in whom I am well pleased.
18 And THIS VOICE which came from heaven we heard, when we were with him in the holy mount.
19 We have also A MORE SURE WORD OF PROPHECY; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
20 Knowing this first, that no PROPHECY OF THE SCRIPTURE is of any private interpretation.
21 For THE PROPHECY came not in old time by the will of man: but HOLY MEN OF GOD SPAKE AS THEY WERE MOVED BY THE HOLY GHOST. ~ 2 Peter 1:16-21
These words from 2 Peter chapter 1, are the lead-in into Peter’s declaration that there would arise false teachers.
1 But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
2 And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of. ~ 2 Peter 2:1-2
The apostle Peter warns of false prophets among the people during the times when holy men of God were moved by the Holy Ghost to speak forth the prophecy, contained in the scriptures, regarding Christ.
It is in this context that Peter tells us there will be false teachers among us. Even as the false prophets opposed the prophecy of Christ, so shall false teachers cause the way of the truth (contained in the more sure word of prophecy) to be evil spoken of.