Musnad Abu Ya'la al-Mawsili 243:16

Abdullah ibn Umar ibn Aban narrated to us, Hafs ibn Ghiyath narrated to us, from Burayd, from Abu Burdah, from Abu Musa, who said: We arrived to the Messenger of Allah (may Allah bless him and grant him peace) three days after Khaybar was conquered. He allocated a share for us, and he did not allocate a share for anyone who did not witness the conquest except for us.