أَوْ تَقُولُوا۟ لَوْ أَنَّآ أُنزِلَ عَلَيْنَا ٱلْكِتَـٰبُ لَكُنَّآ أَهْدَىٰ مِنْهُمْ ۚ فَقَدْ جَآءَكُم بَيِّنَةٌ مِّن رَّبِّكُمْ وَهُدًى وَرَحْمَةٌ ۚ فَمَنْ أَظْلَمُ مِمَّن كَذَّبَ بِـَٔايَـٰتِ ٱللَّهِ وَصَدَفَ عَنْهَا ۗ سَنَجْزِى ٱلَّذِينَ يَصْدِفُونَ عَنْ ءَايَـٰتِنَا سُوٓءَ ٱلْعَذَابِ بِمَا كَانُوا۟ يَصْدِفُونَ
aw taqūlū law annā unzila ʿalaynā l-kitābu lakunnā ahdā min'hum faqad jāakum bayyinatun min rabbikum wahudan waraḥmatun faman aẓlamu mimman kadhaba biāyāti l-lahi waṣadafa ʿanhā sanajzī alladhīna yaṣdifūna ʿan āyātinā sūa l-ʿadhābi bimā kānū yaṣdifūna
or ‘If only the Scripture had been sent down to us, we would have been better guided than them.’ Now clear evidence, guidance, and mercy have come to you from your Lord. Who could be more wrong than someone who rejects God’s revelations and turns away from them? We shall repay those who turn away with a painful punishment.
Or lest you (pagan Arabs) should say: "If only the Book had been sent down to us, we would surely have been better guided than they (Jews and Christians)." So now has come unto you a clear proof (the Qur’ân) from your Lord, and a guidance and a mercy. Who then does more wrong than one who rejects the Ayât (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allâh and turns away therefrom? We shall requite those who turn away from Our Ayât with an evil torment, because of their turning away (from them). [Tafsir At-Tabari]