they swear by allah with solemn oaths that were a sign to come to them they would surely believe in it. say these signs are only from allah and what will bring home to you that they will not believe even if they came?
وأقسموا بالله جهد أيمانهم لئن جاءتهم آية ليؤمنن بها قل إنما الآيات عند الله وما يشعركم أنها إذا جاءت لا يؤمنون