Musannaf Ibn Abi Shayba 6:854

'Isa ibn Yunus narrated to us, from Muhammad ibn Ishaq, from his father, from the elders of the Ansar: They said: "Abdullah ibn 'Amr ibn Haram and 'Amr ibn al-Jamuh were brought to the Messenger of Allah, may Allah bless him and grant him peace, on the day of Uhud, having been mutilated. He said: 'Bury them in one grave, for they were companions in the world.'"