2:408: Ash-Shaibani: Ash-Sha'bi said, Somebody who passed along with your Prophet ...
Narrated Ash-Shaibani:
Ash-Sha'bi said, "Somebody who passed along with your Prophet (p.b.u.h) by a grave that was separate from the other graves informed me (saying), "The Prophet
led us (in the prayer) and we aligned behind him." We said, "O Abu 'Amr! Who told you this narration?" He replied, "Ibn Abbas."