Sahih al-Bukhari 51
صحيح البخاري#51Sahihحَدَّثَنَا إِبْرَاهِيمُ بْنُ حَمْزَةَ، قَالَ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، عَنْ صَالِحٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، أَنَّ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ، أَخْبَرَهُ قَالَ أَخْبَرَنِي أَبُو سُفْيَانَ، أَنَّ هِرَقْلَ، قَالَ لَهُ سَأَلْتُكَ هَلْ يَزِيدُونَ أَمْ يَنْقُصُونَ، فَزَعَمْتَ أَنَّهُمْ يَزِيدُونَ، وَكَذَلِكَ الإِيمَانُ حَتَّى يَتِمَّ. وَسَأَلْتُكَ هَلْ يَرْتَدُّ أَحَدٌ سَخْطَةً لِدِينِهِ بَعْدَ أَنْ يَدْخُلَ فِيهِ، فَزَعَمْتَ أَنْ لاَ، وَكَذَلِكَ الإِيمَانُ حِينَ تُخَالِطُ بَشَاشَتُهُ الْقُلُوبَ، لاَ يَسْخَطُهُ أَحَدٌ.
Narrated 'Abdullah bin 'Abbas: I was informed by Abu Sufyan that Heraclius said to him, "I asked you whether they (followers of Muhammad) were increasing or decreasing. You replied that they were increasing. And in fact, this is the way of true Faith till it is complete in all respects. I further asked you whether there was anybody, who, after embracing his (the Prophets) religion (Islam) became displeased and discarded it. You replied in the negative, and in fact, this is (a sign of) true faith. When its delight enters the heart and mixes with them completely, nobody can be displeased with it
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 2:44