Very weak or denounced — not to be relied upon or attributed to the Prophet ﷺ with certainty.
It was narrated that Abu Musa said:“Ali led us in prayer on the day of (the battle of) the Camel, in a way that reminded us of the prayer of the Messenger of Allah (ﷺ). Either we had forgotten it or we had abandoned it. He said the Salam to his right and to his left.”