وَإِذا قيلَ إِنَّ وَعدَ اللَّهِ حَقٌّ وَالسّاعَةُ لا رَيبَ فيها قُلتُم ما نَدري مَا السّاعَةُ إِن نَظُنُّ إِلّا ظَنًّا وَما نَحنُ بِمُستَيقِنينَ

And when it was said, 'Indeed, the promise of Allah is truth and the Hour [is coming] - no doubt about it,' you said, 'We know not what is the Hour. We assume only assumption, and we are not convinced.' "