And when We substitute a verse in place of a verse - (16:101)

Almuntakhab Fi Tafsir Alquran Alkarim

If We happen to exchange a revelation which has already served its purpose for another revelation appropriate for the new circumstance, and Allah knows exactly what to reveal and when, they -the infidels- accuse your O Muhammad of forgery. Indeed, most of them do not know the facts nor do they reflect

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(16:101) And when We send down one verse to elaborate upon the other-and Allah knows best what to send down-they say, "You forge this Qur'an yourself. " *102 The fact is that most of them do not know the reality.

And when We substitute a verse in place of a verse - meaning

*102) This may also mean, "To send down one Commandment to elaborate upon the other, for the Commandments were sent down piecemeal in the Qur'an". For instance, the Commandments about "prohibition" and fornication were sent down gradually one after the other during several years. But We hesitate to accept this interpretation because An-Nahl is a Makki Surah and to the best of our information there is no instance to show that Commandments were sent down piecemeal at Makkah. Therefore, we prefer the other interpretation. The Qur'an has added details of one theme and explained the same with different kinds of illustrations at different places. Likewise it has related a story in different words at different places and presented its different aspects and details at other places. It has put forward one argument at one place to prove a theme and another at another place to prove the same theme. It has related one theme concisely at one place and in detail at the other. That is what the disbelievers of Makkah put forward as proof that Muhammad (Allah's peace be upon him) forged the Qur'an himself. They argued like this: "Had the Qur'an been the Word of Allah it would have related in full one thing at one place, for Allah's knowledge is not defective that He should have to think out gradually the details of a theme and to give different versions to explain the same thing. In contrast to this, the knowledge of a human being is defective. A man has to think out gradually as has been done in the case of the Qur'an which is a clear proof that you have forged it yourself".
 

And when We substitute a verse in place of a verse - meaning in Urdu

جب ہم ایک آیت کی جگہ دوسری آیت نازل کرتے ہیں اور اللہ بہتر جانتا ہے کہ وہ کیا نازل کرے تو یہ لوگ کہتے ہیں کہ تم یہ قرآن خو د گھڑ تے ہو اصل بات یہ ہے کہ اِن میں سے اکثر لوگ حقیقت سے ناواقف ہیں