Sahih al-Bukhari 1353
Narrated Jabir bin `Abdullah:
The Prophet (ﷺ) collected every two martyrs of Uhud (in one grave) and then he would ask, "Which of 
them knew the Qur'an more?" And if one of them was pointed out for him as having more knowledge, 
he would put him first in the Lahd. The Prophet (ﷺ) said, "I will be a witness on these on the Day of 
Resurrection." Then he ordered them to be buried with their blood on their bodies and he did not have 
them washed.
حَدَّثَنَا عَبْدَانُ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا اللَّيْثُ بْنُ سَعْدٍ، قَالَ حَدَّثَنِي ابْنُ شِهَابٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ كَعْبِ بْنِ مَالِكٍ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يَجْمَعُ بَيْنَ رَجُلَيْنِ مِنْ قَتْلَى أُحُدٍ ثُمَّ يَقُولُ ‏"‏ أَيُّهُمْ أَكْثَرُ أَخْذًا لِلْقُرْآنِ ‏"‏‏.‏ فَإِذَا أُشِيرَ لَهُ إِلَى أَحَدِهِمَا قَدَّمَهُ فِي اللَّحْدِ فَقَالَ ‏"‏ أَنَا شَهِيدٌ عَلَى هَؤُلاَءِ يَوْمَ الْقِيَامَةِ ‏"‏‏.‏ فَأَمَرَ بِدَفْنِهِمْ بِدِمَائِهِمْ وَلَمْ يُغَسِّلْهُمْ‏.‏