Sahih al-Bukhari 5005
Sahih al-Bukhari · Book 66: Virtues of the Qur'an · The Qurra from among the Companions of the Prophet (saws)
Narrated Ibn Abbas:
حَدَّثَنَا صَدَقَةُ بْنُ الْفَضْلِ ، أَخْبَرَنَا يَحْيَى ، عَنْ سُفْيَانَ ، عَنْ حَبِيبِ بْنِ أَبِي ثَابِتٍ ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ ، عَنِ ابْنِ عَبَّاسٍ ، قَالَ قَالَ عُمَرُ أُبَىٌّ أَقْرَؤُنَا وَإِنَّا لَنَدَعُ مِنْ لَحَنِ أُبَىٍّ، وَأُبَىٌّ يَقُولُ أَخَذْتُهُ مِنْ فِي رَسُولِ اللَّهِ صلى الله عليه وسلم فَلاَ أَتْرُكُهُ لِشَىْءٍ قَالَ اللَّهُ تَعَالَى {مَا نَنْسَخْ مِنْ آيَةٍ أَوْ نَنْسَأْهَا نَأْتِ بِخَيْرٍ مِنْهَا أَوْ مِثْلِهَا}
Umar said, Ubayy was the best of us in the recitation (of the Qur'an) yet we leave some of what he recites. Ubayy says, "I have taken it from the mouth of Allah's Messenger (ﷺ) and I will not leave it for anything." But Allah said "None of Our Revelations do We abrogate or cause to be forgotten but We substitute something better or similar." (Quran 2:106)