If they have escaped the corruption of the world by knowing our Lord and Savior Jesus Christ and are again entangled in it and are overcome, they are worse off at the end than they were at the beginning. It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them.
I have seen so many people use this passage to teach believers that they lose their salvation should they remain “worldly” in their behaviour.
What is “corruption of the world”?
When you read the term “corruption of this world” in 2 Peter 2:20, it doesn’t mean the world we live in. It means the fading away of the Law.
By calling this covenant “new,” he has made the first one obsolete; and what is obsolete and outdated will soon disappear.
This “corruption” reached its consummation in AD70 when the Jews’ heaven and earth (the Temple) was destroyed.
You are not partakers of that “corrupted” world. You are partakers of the divine nature.
2 Peter 1:4
Through these he has given us his very great and precious promises, so that through them you may participate in the divine nature, having escaped the corruption in the world caused by evil desires.
You have already escaped that “corruption”.
Now that is the background of what is being said.
This passage is about the Jews who became believers and then returned to Judaism within the period between AD33 to AD70.
It has nothing to do with us. For those of you who are familiar to the events which transpired in AD70, you would note that many Jews became believers through the preaching of Peter.
These Jews who were familiar with the warning Jesus gave in Matthew 24 left Jerusalem. Sadly those who returned to Judaism because of the persecution by the Jews stayed behind.
This is because the Temple in Jerusalem was crucial to their faith, they remained in Jerusalem.
Titus then laid siege in Jerusalem and thereafter massacre the people in Jerusalem. Jerusalem was set of fire and many Jews perished in that holocaust.
In that incident, not one Christian was killed. Those Jews who believed Jesus all left before the siege took place.
May I encourage you to know the historical background of every book in the Bible. You will be surprised to find a God who is interested in saving his people rather than killing his people.