Musnad Abu Ya'la al-Mawsili 78:2

Shayban ibn Farrukh narrated to us, Sulayman ibn al-Mughirah narrated to us, Humayd ibn Hilal narrated to us, from Hisham ibn Amir, who said: The Ansar came on the day of Uhud and said, "O Messenger of Allah, we have been afflicted with wounds and exhaustion, so what do you command us?" He said, "Dig, widen, and place two or three men in one grave." They said, "Whom shall we put forward?" He said, "Put forward the one among you who has the most Quran." He said, "So my father was put forward before two of the Ansar," or he said, "one of the Ansar."