Or lest you say, "If only the Scripture had been revealed to (6:157)

﴿أَوْ تَقُولُوا لَوْ أَنَّا أُنزِلَ عَلَيْنَا الْكِتَابُ لَكُنَّا أَهْدَىٰ مِنْهُمْ ۚ فَقَدْ جَاءَكُم بَيِّنَةٌ مِّن رَّبِّكُمْ وَهُدًى وَرَحْمَةٌ ۚ فَمَنْ أَظْلَمُ مِمَّن كَذَّبَ بِآيَاتِ اللَّهِ وَصَدَفَ عَنْهَا ۗ سَنَجْزِي الَّذِينَ يَصْدِفُونَ عَنْ آيَاتِنَا سُوءَ الْعَذَابِ بِمَا كَانُوا يَصْدِفُونَ﴾
[ الأنعام: 157]

6:157 Or lest you say, "If only the Scripture had been revealed to us, we would have been better guided than they." So there has [now] come to you a clear evidence from your Lord and a guidance and mercy. Then who is more unjust than one who denies the verses of Allah and turns away from them? We will recompense those who turn away from Our verses with the worst of punishment for their having turned away.

Likewise, I sent this Book so that you do not say: If Allah had revealed a scripture to us, just as He did to the Jews and Christians, we would have been more upright than them.
So now has Allah revealed the Book to your prophet, Muhammad ( peace be upon him ), in your language: a clear proof, guidance, and a mercy for the entire nation.
Then do not offer false excuses and give invalid reasons for rejecting it.
Surely the greatest wrongdoer is the person who denies Allah’s ayahs and turns away from them.
Allah will punish those who turn away from His words with a severe punishment, by causing them to enter the fire of Hell as a repayment for their turning away from and ignoring them.

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 Quran) from your Lord, and a guidance and a mercy. Who then does more wrong than one who rejects the Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) of Allah and turns away therefrom? We shall requite those who turn away from Our Ayat with an evil torment, because of their turning away (from them). [Tafsir At-Tabari, Vol. 8, Page 95]

phonetic Transliteration

Aw taqooloo law anna onzila AAalayna alkitabu lakunna ahda minhum faqad jaakum bayyinatun min rabbikum wahudan warahmatun faman athlamu mimman kaththaba biayati Allahi wasadafa AAanha sanajzee allatheena yasdifoona AAan ayatina sooa alAAathabi bima kanoo yasdifoona

Abdullah Yusuf Ali - Translation

Or lest ye should say: "If the Book had only been sent down to us, we should have followed its guidance better than they." Now then hath come unto you a clear (sign) from your Lord,- and a guide and a mercy: then who could do more wrong than one who rejecteth Allah's signs, and turneth away therefrom? In good time shall We requite those who turn away from Our signs, with a dreadful penalty, for their turning away.

Safi-ur-Rahman al-Mubarakpuri

Or lest you should say: "If only the Book had been sent down to us, we would surely have been better guided than they." So now has come unto you a clear proof from your Lord, and a guidance and a mercy. Who then does more wrong than one who rejects the Ayat of Allah and Sadafa away therefrom We shall requite those who turn away from Our Ayat with an evil torment, because of their turning away.

Page 149 English transliteration