كتاب المغازى
64  
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
(54)
Chapter: “…and on the day of Hunain when you rejoiced at your great number….”
(54)
بَابُ قَوْلِ اللَّهِ تَعَالَى: {وَيَوْمَ حُنَيْنٍ إِذْ أَعْجَبَتْكُمْ كَثْرَتُكُمْ فَلَمْ تُغْنِ عَنْكُمْ شَيْئًا وَضَاقَتْ عَلَيْكُمُ الأَرْضُ بِمَا رَحُبَتْ ثُمَّ وَلَّيْتُمْ مُدْبِرِينَ ثُمَّ أَنْزَلَ اللَّهُ سَكِينَتَهُ} إِلَى قَوْلِهِ: {غَفُورٌ رَحِيمٌ}
Sahih al-Bukhari 4317

Narrated Abu 'Is-haq:

That he heard Al-Bara narrating when a man from Qais (tribe) asked him "Did you flee leaving Allah's Messenger (ﷺ) on the day (of the battle) of Hunain?" Al-Bara' replied, "But Allah's Messenger (ﷺ) did not flee. The people of Hawazin were good archers, and when we attacked them, they fled. But rushing towards the booty, we were confronted by the arrows (of the enemy). I saw the Prophet (ﷺ) riding his white mule while Abu Sufyan was holding its reins, and the Prophet (ﷺ) was saying "I am the Prophet (ﷺ) undoubtedly." (Israil and Zuhair said, "The Prophet (ﷺ) dismounted from his Mule.")

حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي إِسْحَاقَ، سَمِعَ الْبَرَاءَ ـ وَسَأَلَهُ رَجُلٌ مِنْ قَيْسٍ ـ أَفَرَرْتُمْ عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم يَوْمَ حُنَيْنٍ فَقَالَ لَكِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَمْ يَفِرَّ، كَانَتْ هَوَازِنُ رُمَاةً، وَإِنَّا لَمَّا حَمَلْنَا عَلَيْهِمِ انْكَشَفُوا، فَأَكْبَبْنَا عَلَى الْغَنَائِمِ، فَاسْتُقْبِلْنَا بِالسِّهَامِ، وَلَقَدْ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَلَى بَغْلَتِهِ الْبَيْضَاءِ، وَإِنَّ أَبَا سُفْيَانَ آخِذٌ بِزِمَامِهَا وَهْوَ يَقُولُ ‏{‏أَنَا النَّبِيُّ لاَ كَذِبْ‏}‏‏.‏ قَالَ إِسْرَائِيلُ وَزُهَيْرٌ نَزَلَ النَّبِيُّ صلى الله عليه وسلم عَنْ بَغْلَتِهِ‏.‏
Reference : Sahih al-Bukhari 4317
In-book reference : Book 64, Hadith 348
USC-MSA web (English) reference : Vol. 5, Book 59, Hadith 607
  (deprecated numbering scheme)