they swear a solemn oath by god that if there should come to them a sign they will believe in it. say signs are granted only by god. how can you tell that if a sign be given to them they will indeed believe in it?
وأقسموا بالله جهد أيمانهم لئن جاءتهم آية ليؤمنن بها قل إنما الآيات عند الله وما يشعركم أنها إذا جاءت لا يؤمنون