Musnad Ahmad 788:151

Ishaq ibn Isa narrated to us, Hafs ibn Ghiyath narrated to us, from Burayd ibn Abdullah ibn Abi Burdah, from his father, from his grandfather Abu Musa al-Ash'ari, who said: I arrived to the Messenger of Allah (may Allah bless him and grant him peace) with some people of my tribe three days after the conquest of Khaybar. He allotted a share for us, and he did not allot a share for anyone who did not witness the conquest other than us.