(It is not for any) disbelieving (soul to believe) in Allah (save by the permission of Allah) save by Allah's will and given success. (He hath set uncleanness) He leaves denial (upon those) in the hearts of those (who have no sense) who do not apprehend Allah's divine Oneness. This verse was revealed about Abu Talib. The Prophet (pbuh) was so keen that he believes, but Allah did not want him to believe.