Musannaf Ibn Abi Shayba 36:223

'Isa ibn Yunus narrated to us, from Muhammad ibn Ishaq, from his father, from elders of the Ansar: They said: 'Abdullah ibn 'Amr ibn Haram and 'Amr ibn al-Jamuh were brought to the Messenger of Allah, peace and blessings of Allah be upon him, as two slain men. He said: "Bury them in one grave, for they were mutually affectionate in the world."