Ali bin Yahya bin Khallad narrates from his father, from his uncle, who was a Companion who had fought at Badr; he said: We were sitting with the Messenger of Allah (peace and blessings be upon him) when a man came and began to pray. He prayed a light prayer, completing neither its bowing nor its prostration, and the Messenger of Allah (peace and blessings be upon him) was watching him. Then the narrator mentioned a hadith similar to it.
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4509