Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ إِسْمَاعِيلَ، عَنْ قَيْسِ بْنِ أَبِي حَازِمٍ، قَالَ سَمِعْتُ خَالِدَ بْنَ الْوَلِيدِ، يَقُولُ لَقَدِ انْقَطَعَتْ فِي يَدِي يَوْمَ مُوتَةَ تِسْعَةُ أَسْيَافٍ، فَمَا بَقِيَ فِي يَدِي إِلاَّ صَفِيحَةٌ يَمَانِيَةٌ.Narrated Khalid bin Al-Walid:On the day (of the battle of) Mu'tah, nine swords were broken in my hand, and nothing was left in my hand except a Yemenite sword of mine
From Sahih al-Bukhari, whose reports the scholars accept as authentic.