Hour, surely coming there is no doubt

Indeed, the Hour is coming - no doubt about it - but most of the people do not believe.

And when it was said, 'Indeed, the promise of Allāh 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.'"

Indeed, what you are promised is true.

And indeed, the recompense is to occur.