Deuteronomy 13:17 "It shall remain a ruin forever, it shall not be built again"

A city whose people had been led astray and worshipped idols, is called a "Nidachat City," an "apostate city."

The Torah teaches us what to do with such a city (See positive Mitzvah 186).

First, a detailed investigation must be made in order to declare it "Nidachat."

If the charge is proven to be true, then the city must be destroyed.

This Negative Mitzvah prohibits us from ever rebuilding this "Nidachat" city again.