Even if there were a Qur’an that could move mountains, cleft the earth asunder or make the dead speak (do you think the result would have been different?) Surely all things are subject to Allah’s Will. Have not yet the believers been satisfied that if Allah wanted, He would have certainly guided the whole of mankind? As for the unbelievers, the disaster will not cease to afflict them every now and then or strike close to their homes for their misdeeds, until the promise of Allah is fulfilled; surely Allah will not fail His promise.
Meaning:-
Cleft: a split
Asunder: into separate parts; in or into pieces, apart or widely separated:
Afflict: (of a problem or illness) cause pain or suffering to; affect or trouble.