Narrated Anas bin Malik:

Abu Jahl said, "O Allah! If this (Qur'an) is indeed the Truth from You), then rain down on us a shower of stones from the sky or bring on us a painful punishment." So there was revealed:-- 'But Allah would not punish them while you (Muhammad) were amongst them, nor will He punish them while they seek (Allah's) Forgiveness. And why Allah should not punish them while they stop (men) from Al-Masjid-al-Haram ..' (8.33-34)

حَدَّثَنَا مُحَمَّدُ بْنُ النَّضْرِ، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ الْحَمِيدِ، صَاحِبِ الزِّيَادِيِّ سَمِعَ أَنَسَ بْنَ مَالِكٍ، قَالَ قَالَ أَبُو جَهْلٍ ‏{‏اللَّهُمَّ إِنْ كَانَ هَذَا هُوَ الْحَقَّ مِنْ عِنْدِكَ فَأَمْطِرْ عَلَيْنَا حِجَارَةً مِنَ السَّمَاءِ أَوِ ائْتِنَا بِعَذَابٍ أَلِيمٍ‏}‏ فَنَزَلَتْ ‏{‏وَمَا كَانَ اللَّهُ لِيُعَذِّبَهُمْ وَأَنْتَ فِيهِمْ وَمَا كَانَ اللَّهُ مُعَذِّبَهُمْ وَهُمْ يَسْتَغْفِرُونَ * وَمَا لَهُمْ أَنْ لاَ يُعَذِّبَهُمُ اللَّهُ وَهُمْ يَصُدُّونَ عَنِ الْمَسْجِدِ الْحَرَامِ‏}‏ الآيَةَ‏.‏
USC-MSA web (English) reference : Vol. 6, Book 60, Hadith 172
Arabic reference : Book 65, Hadith 4649