those who eat riba will not stand except like the standing of a person beaten by shaytan leading him to insanity. that is because they say trading is only like riba whereas allah has permitted trading and forbidden riba. so whosoever receives an admonition from his lord and stops eating riba shall not be punished for the past his case is for allah but whoever returns such are the dwellers of the fire  they will abide therein.
الذين يأكلون الربا لا يقومون إلا كما يقوم الذي يتخبطه الشيطان من المس ذلك بأنهم قالوا إنما البيع مثل الربا وأحل الله البيع وحرم الربا فمن جاءه موعظة من ربه فانتهى فله ما سلف وأمره إلى الله ومن عاد فأولئك أصحاب النار هم فيها خالدون