"And whenever a chapter is revealed, there are some of them who say: Which of you has it strengthened in faith? Then as for those who believe, it strengthens them in faith and they rejoice. And as for those in whose hearts is a disease, it adds uncleanness to their uncleanness and they die while they are unbelievers. Do they not see that they are tried once or twice in every year, yet they do not turn (to Allah) nor do they mind. And whenever a chapter is revealed, they cast glances at one another: Does any one see you? Then they turn away: Allah has turned away their hearts because they are a people who do not understand."