and they swear by allah their strongest oaths that if a sign came to them they would surely believe in it. say the signs are only with allah. and what will make you perceive that even if a sign came they would not believe.
وأقسموا بالله جهد أيمانهم لئن جاءتهم آية ليؤمنن بها قل إنما الآيات عند الله وما يشعركم أنها إذا جاءت لا يؤمنون