It is narrated from Hisham bin Amir (may Allah be pleased with him) that the Ansar came to the Messenger of Allah (peace and blessings be upon him) on the day of Uhud and said: O Messenger of Allah, we have suffered wounds and hardship, so what do you command us? He (peace and blessings be upon him) said: "Dig deep and wide, and put two or three men in one grave." They said: Whom shall we put first in the grave? He (peace and blessings be upon him) said: "The one who knows the most Qur'an." He says: My father was put ahead of two men, or one.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6751
Sulayman bin al-Mughirah says: In the Battle of Uhud the Ansar suffered wounds and also had to endure hardship. The Ansar told this to the beloved Prophet (peace and blessings be upon him) and said: What do you command us? He (peace and blessings be upon him) said: "Make the graves wide." Abdullah says: I think he (peace and blessings be upon him) said: "Make them deep." Then Abdullah said: Rather, it was exactly like that.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6752
Hisham bin Amir (may Allah be pleased with him) says: The Prophet (peace and blessings be upon him) said concerning those killed at Uhud: "Dig their graves deep and do it well, and bury two or three in one grave."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6753
Sa'd bin Hisham bin Amir narrates from his father (Hisham bin Amir, may Allah be pleased with him) that in the Battle of Uhud the wounds were severe, and this was complained of to the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) said: "Make the graves wide and make them well, and bury two or three in one grave."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6754
Asim bin Kulayb narrates from his father, who narrates from a man of the Ansar, who said: We went out with the Messenger of Allah (peace and blessings be upon him) for a funeral, and I was a boy with my father. He (peace and blessings be upon him) sat at the edge of the grave pit and was saying to those digging it: "Make it wide at the head side, make it wide at the feet side; many a cluster (of dates) will be his in Paradise."
In a narration of Abu Abdullah: I saw him sitting at the edge of the grave pit, and he (peace and blessings be upon him) said: "Make it wide at his head side; many a cluster will be his in Paradise."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6755