Narrated AbuSalam:

AbuSalam reported on the authority of a man from the companion of the Prophet ﷺ. He said: We attacked a tribe of Juhaynah. A man from the Muslims pursued a man of them, and struck him but missed him. He struck himself with the sword. The Messenger of Allah ﷺ said: Your brother, O group of Muslims. The people hastened towards him, but found him dead. The Messenger of Allah ﷺ wrapped him with his clothes and his blood, and offered (funeral) prayer for him and buried him. They said: Messenger of Allah, is he a martyr? He said: Yes, and I am witness to him.

حَدَّثَنَا هِشَامُ بْنُ خَالِدٍ الدِّمَشْقِيُّ، حَدَّثَنَا الْوَلِيدُ، عَنْ مُعَاوِيَةَ بْنِ أَبِي سَلاَّمٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ أَبِي سَلاَّمٍ، عَنْ رَجُلٍ، مِنْ أَصْحَابِ النَّبِيِّ ﷺ قَالَ : أَغَرْنَا عَلَى حَىٍّ مِنْ جُهَيْنَةَ فَطَلَبَ رَجُلٌ مِنَ الْمُسْلِمِينَ رَجُلاً مِنْهُمْ فَضَرَبَهُ فَأَخْطَأَهُ وَأَصَابَ نَفْسَهُ بِالسَّيْفِ فَقَالَ رَسُولُ اللَّهِ ﷺ : " أَخُوكُمْ يَا مَعْشَرَ الْمُسْلِمِينَ " . فَابْتَدَرَهُ النَّاسُ فَوَجَدُوهُ قَدْ مَاتَ، فَلَفَّهُ رَسُولُ اللَّهِ ﷺ بِثِيَابِهِ وَدِمَائِهِ وَصَلَّى عَلَيْهِ وَدَفَنَهُ، فَقَالُوا : يَا رَسُولَ اللَّهِ أَشَهِيدٌ هُوَ قَالَ : " نَعَمْ، وَأَنَا لَهُ شَهِيدٌ " .