The Messenger of Allah ﷺ used to combine two of the slain of Uhud in a single garment, then he would ask, "Which of them had memorized more of the Quran?" When one of them was pointed out to him, he placed that one first in the grave niche and said, "I will be a witness over these on the Day of Judgment." He ordered that they be buried with their blood still on them, and he neither prayed over them nor washed them.
حدثنا محمد بن مقاتل أخبرنا عبد الله أخبرنا ليث بن سعد حدثني ابن شهاب عن عبد الرحمن بن كعب بن مالك
أن رسول الله ﷺ كان يجمع بين الرجلين من قتلى أحد في ثوب واحد ثم يقول أيهم أكثر أخذا للقرآن فإذا أشير له إلى أحدهما قدمه في اللحد وقال أنا شهيد على هؤلاء وأمر بدفنهم بدمائهم ولم يصل عليهم ولم يغسلهم
Bukhari reported the hadith of Layth, from Zuhri, from Abdul-Rahman bin Kaab, from Jabir, that he used to combine the slain of Uhud in one grave, giving precedence to whoever among them knew the most Quran.He said, Ibn Mubarak narrated it from Uzai, from Zuhri, as a mursal narration from Jabir. Sulayman bin Kathir said, from Zuhri, "Someone who heard Jabir told me." And Maamar said, from Zuhri, from Ibn Abu Sughayrah, from Jabir, and it is inconsistent.
Al-Hafiz, may Allah have mercy on him, said in the introduction to Fath al-Bari, page 355, after mentioning Daraqutni's statement, "Daraqutni made an absolute claim regarding this hadith that it is mudtarib (confused in its transmission), even though it is possible to rule out the presence of idtirab in it. This can be done by explaining the unspecified person in Sulayman's narration through the named person in Layth's narration, and by understanding Mamar's narration as meaning that Zuhri heard it from two different teachers. As for the mursal narration of Uzai, he fell short in it by omitting the intermediary link. This is the approach of those who deny that idtirab exists in it.Bukhari mentioned the difference of opinion regarding it, but he only included Uzai's narration despite its being disconnected, because in his view the hadith comes from Abdullah, from Layth and Uzai together, both from Zuhri. Uzai omitted Abdul-Rahman bin Kaab, while Layth included him. Both of them are equal in their transmission from Zuhri, since both explicitly stated that they heard it directly from him. So the addition made by Layth was accepted because of his reliability."He then said, "Sulayman bin Kathir narrated it from Zuhri, from someone who heard it from Jabir." By this he meant to establish, in a general sense, that there was an intermediary between Zuhri and Jabir in this hadith, and to reinforce Layth's narration through this. He did not consider this to be a flaw requiring a judgment of idtirab.