Peter's Farewell Warning
In his farewell epistle (see the Fact Finder question below), the apostle Peter warned of the corruption that was sure to come upon the Church of God, from within, by those who were not truly converted when they entered, or who fell away from the Truth after they had it.
"2:1 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. 2:2 And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of. 2:3 And through covetousness shall they with feigned words make merchandise of you: whose judgment now of a long time lingereth not, and their Damnation slumbereth not." (2 Peter 2:1-3 KJV)
"The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire"
Although he had obviously mellowed by the end of his life, Peter was still a plain speaker. Like all of the others, Peter was no "diplomat" - he was a preacher of the Truth. Peter could tell (figuratively and verbally) good from evil.
"2:4 For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of Darkness, to be reserved unto judgment [see also When Will You Be Judged?]; 2:5 And spared not the old world, but saved Noah the eighth person, a preacher of righteousness, bringing in The Flood upon the world of the ungodly; 2:6 And turning the cities of Sodom [see Sodomites] and Gomorrha into ashes condemned them with an overthrow, making them an ensample unto those that after should live ungodly [see They Shall Be Ashes, Baptism Of Fire and Planet On Fire!]; 2:7 And delivered just Lot, vexed with the filthy conversation of the wicked: 2:8 For that righteous man dwelling among them, in seeing and hearing, vexed his righteous soul from day to day with their unlawful deeds; 2:9 The Lord knoweth how to deliver the godly out of temptations, and to reserve the unjust unto the day of judgment to be punished: 2:10 But chiefly them that walk after the flesh in the lust of uncleanness, and despise government.
Fact Finder: At the beginning of Peter's second epistle (part of which is quoted above), Peter said "1:14 Knowing that shortly I must put off this my tabernacle, even as our Lord Jesus Christ hath showed me" (2 Peter 1:14 KJV). When did Jesus Christ tell Peter that? What was He saying was going to happen to Peter?