Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
65/15.4. Chapter:
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)
{الْمُقْتَسِمِينَ} الَّذِينَ حَلَفُوا وَمِنْهُ: {لاَ أُقْسِمُ} أَيْ أُقْسِمُ وَتُقْرَأُ لأُقْسِمُ. {قَاسَمَهُمَا} حَلَفَ لَهُمَا وَلَمْ يَحْلِفَا لَهُ.وَقَالَ مُجَاهِدٌ: {تَقَاسَمُوا} تَحَالَفُوا.
Sahih Bukhari
حَدَّثَنِي عُبَيْدُ اللَّهِ بْنُ مُوسَى، عَنِ الأَعْمَشِ، عَنْ أَبِي ظَبْيَانَ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ {كَمَا أَنْزَلْنَا عَلَى الْمُقْتَسِمِينَ} قَالَ آمَنُوا بِبَعْضٍ وَكَفَرُوا بِبَعْضٍ، الْيَهُودُ وَالنَّصَارَى.
Narrated Ibn `Abbas concerning: "As We have sent down (the Scripture) on those who are divided (Jews and Christians)." (15.90) They believed in part of it and disbelieved in the other, (and they) are the Jews and the Christians.
Reference : Sahih al-Bukhari 4706In-book reference : Book 65, Hadith 228USC-MSA web (English) reference : Vol. 6, Book 60, Hadith 229