Musannaf Ibn Abi Shaybah

Jabir bin Abdullah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) would gather two men from among the martyrs of Uhud in one cloth. Then he (peace and blessings be upon him) would ask, "Which of them knew more of the Qur'an?" When one of them was pointed out to him, he (peace and blessings be upon him) would lower him into the grave first and would say, "I will be a witness over these people on the Day of Resurrection." He (peace and blessings be upon him) ordered that the martyrs be buried with their blood, and he (peace and blessings be upon him) did not offer the funeral prayer over them, nor were they given a ritual bath.