Peter next described the consequences that follow false teaching to help his readers see the importance of avoiding it. [source][source][source]
"Verses4-10a form one long, complex conditional sentence; 2 Peter 2:4-8 form the conditional statement, and 2 Peter 2:9-10 a the conclusion. This long sentence skillfully combines the different aspects involved in God"s judicial dealings with mankind." [1][source]
"Now Peter will give us three examples of apostates in the past. His first example is of the angels who sinned ( 2 Peter 2:4), and it is an example of how the Devil works. His second example is that of the world of Noah"s day ( 2 Peter 2:5), and it is the example of the world. The third example ( 2 Peter 2:6) is the turning of the cities of Sodom and Gomorrah into ashes, and that is the example of the flesh." [2][source]