حَدَّثَنِي أَحْمَدُ بْنُ سَعِيدٍ أَبُو عَبْدِ اللَّهِ، حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ يُوسُفَ، عَنْ أَبِيهِ، عَنْ أَبِي إِسْحَاقَ، سَأَلَ رَجُلٌ الْبَرَاءَ وَأَنَا أَسْمَعُ، قَالَ أَشَهِدَ عَلِيٌّ بَدْرًا قَالَ بَارَزَ وَظَاهَرَ‏.‏

Narrated Abu 'Is-haq: A man asked Al-Bara' and I was listening, "Did `Ali take part in (the battle of) Badr?" Al-Bara' said, "(Yes). he even met (his enemies) in a duel and was clad in two armors (one over the other). Translation Not Available

Book Ref: Sahih Bukhari Book 64 Hadith 3970
Web Ref:  Sahih Bukhari Vol 5 Book 59 Hadith 309