Sahih al-Bukhari 4705
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · The Statement of Allah "Who have made the Qur'an into parts (i.e., believed in one part and disbelieved in the other) ." (V.15:91)
Narrated Ibn `Abbas:
حَدَّثَنِي يَعْقُوبُ بْنُ إِبْرَاهِيمَ ، حَدَّثَنَا هُشَيْمٌ ، أَخْبَرَنَا أَبُو بِشْرٍ ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ ، عَنِ ابْنِ عَبَّاسٍ ، رضى الله عنهما {الَّذِينَ جَعَلُوا الْقُرْآنَ عِضِينَ} قَالَ هُمْ أَهْلُ الْكِتَابِ، جَزَّءُوهُ أَجْزَاءً، فَآمَنُوا بِبَعْضِهِ وَكَفَرُوا بِبَعْضِهِ.
Those who have made their Scripture into parts are the people of the Scripture who divided it into portions and believed in a part of it and disbelieved the other.