The Messenger of Allah (ﷺ) combined two persons from among the martyrs of Uhud (in one garment), and said: Which of the two has learnt the Qur'an more ? When one of them was pointed to him, he advanced him in the grave, saying: I shall be witness to all these (martyrs) on the Day of Judgement. He then ordered them to be buried without being washed.
Reference: Sunan Abi Dawud 3138 In-book : Book 21, Hadith 50 English translation : Book 20, Hadith 3132
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