Sunan Ibn Majah, Volume 2, Book 5, Hadith 917 (DarusSalam) ⓘ

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. Either we had forgotten it or we had abandoned it. He said the Salam to his right and to his left.”

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَامِرِ بْنِ زُرَارَةَ، حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنْ أَبِي إِسْحَاقَ، عَنْ بُرَيْدِ بْنِ أَبِي مَرْيَمَ، عَنْ أَبِي مُوسَى، قَالَ صَلَّى بِنَا عَلِيٌّ يَوْمَ الْجَمَلِ صَلاَةً ذَكَّرَنَا صَلاَةَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فَإِمَّا أَنْ نَكُونَ نَسِينَاهَا وَإِمَّا أَنْ نَكُونَ تَرَكْنَاهَا فَسَلَّمَ عَلَى يَمِينِهِ وَعَلَى شِمَالِهِ ‏.‏