Babylonian Talmud, Shabbat 33. "R. Simeon b. Johai [sic] said: 'All these things they have instituted for their own sake. Their markets are gathering-places for harlots; they have built baths for the purpose of indulging themselves in their comforts; they have built bridges to collect tolls from those who cross them.'" Full text available at http://www.sacred-texts.com/jud/t01/t0110.htm