2 Peter 2:6

and having reduced to ashes the cities of Sodom and Gomorrah, punished them with an overthrow, making them an example to those who should afterward live ungodly:

Jude 1:7

Likewise Sodom and Gomorrah, and the cities around them, which, after their example, had habitually committed uncleanness, and gone after other flesh, are set forth an example, suffering the punishment of an eternal fire.

Jude 1:15

to pass sentence on all, and to convict all the ungodly among them, of all their deeds of ungodliness; which they have impiously committed; and of all the hard things which ungodly sinners have spoken against him."

Treasury of Scripture Knowledge

Summary

And turning the cities of Sodom and Gomorrha into ashes condemned them with an overthrow, making them an ensample unto those that after should live ungodly;

Turning

Bible References

Turning

Jude 1:7
Likewise Sodom and Gomorrah, and the cities around them, which, after their example, had habitually committed uncleanness, and gone after other flesh, are set forth an example, suffering the punishment of an eternal fire.