and when it was said indeed the promise of allah is truth and the hour no doubt about it you said we know not what is the hour. we assume only assumption and we are not convinced. 
وإذا قيل إن وعد الله حق والساعة لا ريب فيها قلتم ما ندري ما الساعة إن نظن إلا ظنا وما نحن بمستيقنين