they solemnly swear by allah that if a sign is given to them they would believe in it. say signs are only with allah and how can you tell if it comes they will not believe
وأقسموا بالله جهد أيمانهم لئن جاءتهم آية ليؤمنن بها قل إنما الآيات عند الله وما يشعركم أنها إذا جاءت لا يؤمنون