Narrated 'Imran bin Husain (RA):

The Prophet (ﷺ) led them [the Companions (RA)] in prayer and forgot (something). He then made two prostrations and then said the Tashahhud and uttered the Taslim (salutation). [Reported by Abu Dawud, and at-Tirmidhi who graded it Hasan (good), and al-Hakim who graded it Sahih (authentic)].

وَعَنْ عِمْرَانَ بْنِ حُصَيْنٍ ‏-رَضِيَ اَللَّهُ تَعَالَى عَنْهُ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-صَلَّى بِهِمْ , فَسَهَا فَسَجَدَ سَجْدَتَيْنِ , ثُمَّ تَشَهَّدَ , ثُمَّ سَلَّمَ } رَوَاهُ أَبُو دَاوُدَ , وَاَلتِّرْمِذِيُّ وَحَسَّنَهُ , وَالْحَاكِمُ وَصَحَّحَهُ .‏ [1]‏