Sahih al-Bukhari 1346

Arabic

حَدَّثَنَا أَبُو الْوَلِيدِ، حَدَّثَنَا لَيْثٌ، عَنِ ابْنِ شِهَابٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ كَعْبٍ، عَنْ جَابِرٍ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ ادْفِنُوهُمْ فِي دِمَائِهِمْ ‏"‏‏.‏ ـ يَعْنِي يَوْمَ أُحُدٍ ـ وَلَمْ يُغَسِّلْهُمْ‏.‏

English translation

Narrated Jabir:The Prophet (ﷺ) said, "Bury them (i.e. martyrs) with their blood." (that was) On the day of the Battle of Uhud. He did not get them washed

Reference: Sahih al-Bukhari 1346, Book of Funerals (Al-Janaa'iz). English translation by Dr. Muhammad Muhsin Khan.