Most people are aware that Jewish law forbade earning interest from the lending of money to another. As Christianity gained momentum in the early first and second century, many of the Mosaic laws were abandoned, although certain aspects remained in place - for example, punishments for parental disrespect were abandoned although Christians taught that a child ought to respect his or her parents.
Is this another case of the letter of the law morphing into the spirit of the law? Christians seem to generally believe that it's sinful to impoverish another by means of lending practices, but that doesn't really stop many forms of interest charging that were previously forbidden. Is there any relevant scripture or literature relating to usury after the death of Christ?