'Sodom and Gomorrah' in the Bible

Truly, I say to you, it will be more tolerable on the day of judgment for the land of Sodom and Gomorrah than for that town.

and if he condemned the cities of Sodom and Gomorrah to destruction by reducing them to ashes, having made them an example to those who would live ungodly thereafter;

just as Sodom and Gomorrah and the surrounding cities, which likewise acted immorally and indulged in strange flesh, serve as an example by undergoing a punishment of eternal fire.