Sunan Abi Dawud, Hadith 2532 ⓘ
Salamah bin Al Akwa’ said “On the day of the battle of the Khaibar, my brother fought desperately. But his sword fell back on him and killed him. The Companions of the Apostle of Allaah talked about him and doubted it (his martyrdom) saying “A man who died with his own weapon”. The Apostle of Allaah said “he died as a warrior striving in the path of Allaah. Ibn Shihab said “I asked the son of Salamah bin Al Akwa’.” He narrated to me on the authority of his father similar to that except that he said “The Apostle of Allaah said “They told a lie, he died as a warrior striving in the path of Allaah. There is a double reward for him.””
حَدَّثَنَا أَحْمَدُ بْنُ صَالِحٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي عَبْدُ الرَّحْمَنِ، وَعَبْدُ اللَّهِ بْنُ كَعْبِ بْنِ مَالِكٍ، قَالَ أَبُو دَاوُدَ قَالَ أَحْمَدُ : كَذَا قَالَ هُوَ - يَعْنِي ابْنَ وَهْبٍ - وَعَنْبَسَةُ - يَعْنِي ابْنَ خَالِدٍ - جَمِيعًا عَنْ يُونُسَ قَالَ أَحْمَدُ : وَالصَّوَابُ عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ أَنَّ سَلَمَةَ بْنَ الأَكْوَعِ قَالَ : لَمَّا كَانَ يَوْمُ خَيْبَرَ قَاتَلَ أَخِي قِتَالاً شَدِيدًا، فَارْتَدَّ عَلَيْهِ سَيْفُهُ فَقَتَلَهُ فَقَالَ أَصْحَابُ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي ذَلِكَ - وَشَكُّوا فِيهِ - : رَجُلٌ مَاتَ بِسِلاَحِهِ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم : " مَاتَ جَاهِدًا مُجَاهِدًا " . قَالَ ابْنُ شِهَابٍ : ثُمَّ سَأَلْتُ ابْنًا لِسَلَمَةَ بْنِ الأَكْوَعِ فَحَدَّثَنِي عَنْ أَبِيهِ بِمِثْلِ ذَلِكَ، غَيْرَ أَنَّهُ قَالَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم : " كَذَبُوا مَاتَ جَاهِدًا مُجَاهِدًا فَلَهُ أَجْرُهُ مَرَّتَيْنِ " .
also referenced under: Hadith 2538 (DarusSalam)