Surah Al-Furqan, Ayah 36

Frightening the Idolators of Quraysh

Allah threatens the idolators who denied and opposed His Messenger Muhammad ﷺ and He warns them of the punishment and painful torment He sent upon the previous nations who rejected their Messengers. Allah begins by mentioning Musa, upon him be peace, whom He sent along with his brother Harun as a helper -- i.e., as another Prophet who helped and supported him -- but Fir`awn and his chiefs denied them both:

دَمَّرَ اللَّهُ عَلَيْهِمْ وَلِلْكَـفِرِينَ أَمْثَـلُهَا

(Allah destroyed them completely, and similar (awaits) the disbelievers) (47:10). And when the people of Nuh denied him, Allah destroyed them likewise, for whoever denies one Messenger denies all the Messengers, because there is no difference between one Messenger and another. If it had so happened that Allah had sent all His Messengers to them, they would have denied them all. Allah says:

الَّذِينَ كَذَّبُوا بِآيَاتِنَا (who have rejected Our signs - 25:36). Here it is described that the people of Pharaoh had denied Allah's verses. It is to be noted that by that time Torah was not revealed to Sayyidna Musa (علیہ السلام) . Therefore it cannot be Torah which was denied. Hence it is either the proofs of the Oneness of Allah, which can be understood by any one according to his mental level, or the traditions of the past prophets which are passed on through generations, no matter in what little detail, are referred here as rejection of His message. The same thing is referred in Qur'an as well وَلَقَدْ جَاءَكُمْ يُوسُفُ مِن قَبْلُ بِالْبَيِّنَاتِ (Joseph brought you the clear signs before - 40:34). It mentions about the teachings of the earlier prophets, which had also reached them. (Bayan ul-Quran)

When the Quran was revealed, it was not revealed all at once, but part by part over a period of 23 years. Those who denied the truth made this an excuse to say that this was a man-made book and not the book of God, because it would not have been difficult for God to prepare the whole book at one time. It was clarified that the Quran was not simply the work of any author. It was a divine proclamation of the Truth. One of the strategies of preaching God’s will is that it is presented to people gradually, so that it progressively takes root in society. Every objection against such activity—which is based on perfect Truth—is a false one. Whenever such an objection is raised, but then is properly clarified, the authenticity of the preacher’s call is reinforced; it is never in doubt at any stage.