The Talmud in Sanhedrin (f. 97a) tells of a place called the City of Truth — a settlement where no one had ever spoken a lie. Every word uttered within its walls was honest. Every promise was kept. Every transaction was fair.
A certain traveler heard of this remarkable city and journeyed there to see it for himself. When he arrived, he found the streets clean, the marketplaces orderly, and the people prosperous. No one locked their doors. No one guarded their goods. There was no need, because no one stole and no one deceived.
The traveler decided to stay. For a time, he lived among the honest citizens and marveled at their ways. But then something changed. One day, he told a small lie — just a minor falsehood, hardly worth noticing. The earth beneath his feet trembled. The next day he told another. A crack appeared in the wall of his house. With each deception, the damage grew worse. Buildings began to crumble. The streets buckled.
The citizens came to him in alarm. "What have you done?" they demanded. The traveler confessed his lies, but the damage could not be undone. The City of Truth, which had stood for generations on a foundation of honesty, began to collapse. The rabbis preserved this story as a warning: a single liar can destroy what an entire community of truthful people spent centuries building. God demands truth from His creatures. Truth is not merely a virtue — it is the foundation upon which the world itself stands.