Hadithcore
Sahih Muslim, 1786 a
sahih

It has been narrated on the authority of Anas b. Malik who said:

When they (Companions of the Prophet) were overwhelmed with grief and distress on his return from Hudaibiya where he had slaughtered his sacrificial beasts (not being allowed to proceed to Mecca), the Qur'anic verse: Inna fatahna... laka fathan mobinan to fauzan 'aziman, was revealed to him. (At this) he said: On me has descended a verse that is dearer to me than the whole world.

وَحَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ، حَدَّثَنَا سَعِيدُ بْنُ أَبِي، عَرُوبَةَ عَنْ قَتَادَةَ، أَنَّ أَنَسَ بْنَ مَالِكٍ، حَدَّثَهُمْ قَالَ لَمَّا نَزَلَتْ ‏{‏ إِنَّا فَتَحْنَا لَكَ فَتْحًا مُبِينًا * لِيَغْفِرَ لَكَ اللَّهُ‏}‏ إِلَى قَوْلِهِ ‏{‏ فَوْزًا عَظِيمًا‏}‏ مَرْجِعَهُ مِنَ الْحُدَيْبِيَةِ وَهُمْ يُخَالِطُهُمُ الْحُزْنُ وَالْكَآبَةُ وَقَدْ نَحَرَ الْهَدْىَ بِالْحُدَيْبِيَةِ فَقَالَ ‏

‏ لَقَدْ أُنْزِلَتْ عَلَىَّ آيَةٌ هِيَ أَحَبُّ إِلَىَّ مِنَ الدُّنْيَا جَمِيعًا ‏

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References2 variants
In-Book Reference
Book 32, Hadith 119
USC-MSA web (English) reference
Book 19, Hadith 4409 (deprecated numbering scheme)