Hadithcore
Sahih al-Bukhari, 4314
sahih

Narrated Isma`il:

I saw (a healed scar of) blow over the hand of Ibn Abi `Aufa who said, "I received that blow in the battle of Hunain in the company of the Prophet." I said, "Did you take part in the battle of Hunain?" He replied, "Yes (and in other battles) before it."

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَخْبَرَنَا إِسْمَاعِيلُ، رَأَيْتُ بِيَدِ ابْنِ أَبِي أَوْفَى ضَرْبَةً، قَالَ ضُرِبْتُهَا مَعَ النَّبِيِّ صلى الله عليه وسلم يَوْمَ حُنَيْنٍ‏.‏ قُلْتُ شَهِدْتَ حُنَيْنًا قَالَ قَبْلَ ذَلِكَ‏.‏

References2 variants
In-Book Reference
Book 64, Hadith 345
USC-MSA web (English) reference
Vol. 5, Book 59, Hadith 604 (deprecated numbering scheme)