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كتاب التوحيد
97  
Oneness, Uniqueness of Allah (Tawheed)
(42)
Chapter: “….Every day He is in some affair!”
(42)
باب قَوْلِ اللَّهِ تَعَالَى ‏{‏كُلَّ يَوْمٍ هُوَ فِي شَأْنٍ‏}
Sahih al-Bukhari 7522

Narrated `Ikrima:

Ibn `Abbas said, "How can you ask the people of the Scriptures about their Books while you have Allah's Book (the Qur'an) which is the most recent of the Books revealed by Allah, and you read it in its pure undistorted form?"

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا حَاتِمُ بْنُ وَرْدَانَ، حَدَّثَنَا أَيُّوبُ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ كَيْفَ تَسْأَلُونَ أَهْلَ الْكِتَابِ عَنْ كُتُبِهِمْ وَعِنْدَكُمْ كِتَابُ اللَّهِ أَقْرَبُ الْكُتُبِ عَهْدًا بِاللَّهِ، تَقْرَءُونَهُ مَحْضًا لَمْ يُشَبْ
Reference : Sahih al-Bukhari 7522
In-book reference : Book 97, Hadith 147
USC-MSA web (English) reference : Vol. 9, Book 93, Hadith 613
  (deprecated numbering scheme)