Wa qaalal lazeena kafaroo law laa nuzzila 'alaihil Quraanu jumlatanw waahidah; kazaalika linusabbita bihee fu'aadaka wa rattalnaahu tarteelaa
The disbelievers say, "Why has not the entire Qur'an been sent down to this man all at nce?" -Well, this has been done to impress it deeply on your mind, and (for the same object) We have sent it down piecemeal by degrees.
