2 Peter 2:6

2 Peter 2:6 and turning the cities of Sodom and Gomorrah into ashes condemned them with an overthrow, having made them an example unto those that should live ungodly;

Expanded Translation

and he reduced the cities of Sodom and Gomorrah to ashes with a destructive overthrow, having condemned them; by this act having set them forth as an example (sign) to those living ungodly, irreligious and irreverent lives.

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and turning the cities of Sodom and Gomorrah into ashes condemned them with an overthrow

Either of the above translations of this phrase are possible in the original. For this account, see Genesis 19:1-38, where one notices the historian also terms it the overthrow.

having made them an example unto those that should live ungodly

Here is a third instance where God spared not. (Or, one may regard it as a part of the second, including it along with the preflood people of the ancient world.) An example (hupodeigma) is a sign suggestive of anything, delineation, figure, or copy. Here, their example was bad and, therefore, should serve as a warning to the ungodly. How our whole nation, so filled with vices as vile as sodomy (which sin derives its name from Sodom) could well take heed to what befell these cities!