Then comes verse رُّسُلًا مُّبَشِّرِينَ وَمُنذِرِينَ (-- Messengers giving good tidings and warning...) which succinctly tells that Almighty Allah consistently sent messengers to convey good tidings to all believers and to warn all disbelievers so that there remains no room for the excuse that they did not know the will of God and His Messengers --had they known about it, they would have certainly followed it! Now, that Almighty Allah has sent messengers with miracles and His messengers have shown the straight path of truth, the option of not accepting the true faith cannot be accepted from anyone, under any pretext or excuse. Such is the nature of Divine Revelation. Wahy is an absolute argument, final, conclusive and disarming. No argument stands operative against it. In fact, all arguments lie surrendered under its weight. And this is the wisdom of Allah and His modus operandi.
It has been narrated by Sayyidna Ibn ` Abbas ؓ عنہما that a group of Jews came to the Holy Prophet ﷺ . He said to them: Surely, you do know that I am a true messenger of Ajllah? They refused to accept that whereupon came the following verse (166): لَّـٰكِنِ اللَّـهُ يَشْهَدُ بِمَا أَنزَلَ إِلَيْكَ. 'But Allah bears witness (to your prophethood) through what He has revealed to you ...' The verse addressed to the Holy Prophet ﷺ declares that Allah is a witness to his prophet-hood through the miraculous Qur'an, a perfect message from out of His Knowledge. The Book has been revealed to him with full realization that he is deserving of it, and the angels too join in the testimony. After the very witnessing of the All-Knowing, All-Aware Allah, there is nothing left to argue about.
The text, after having confirmed the veracity of the glorious Qur'an and the noble Prophet ﷺ ، turns to those who still deny them, conceal his character traits and circumstantial indicators of his appearance present in the Torah .and, sordidly enough, try to keep others away from the true faith by bringing out before them things which are not there or things .which have .been jumbled together to distort the truth. For such people, there shall be no forgiveness and no guidance either. Thus, it becomes very clear that guidance or the ability to find the straight path depends on following the Holy Prophet ﷺ and straying away, whatever be its nature, is nothing but hostility towards him. This, then, comprehensively refutes all erroneous ideas of the Jews.