when they are told to prostrate themselves before the beneficent god they say who is the beneficent god? why should we prostrate ourselves before the one whom you have commanded us to? this only increases their rebelliousness.
وإذا قيل لهم اسجدوا للرحمن قالوا وما الرحمن أنسجد لما تأمرنا وزادهم نفورا