بُلُوغُ الْمَرَامِ
Bulugh al-Maram 332
The Book of Prayer
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]
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)].
Sunnah.com reference: Book 2, Hadith 232