Sahih Bukhari · Hadith 1224

حدثنا عبد الله بن يوسف، أخبرنا مالك بن أنس، عن ابن شهاب، عن عبد الرحمن الأعرج، عن عبد الله ابن بحينة رضى الله عنه أنه قال صلى لنا رسول الله صلى الله عليه وسلم ركعتين من بعض الصلوات ثم قام فلم يجلس، فقام الناس معه، فلما قضى صلاته ونظرنا تسليمه كبر قبل التسليم فسجد سجدتين وهو جالس ثم سلم‏.‏

Narrated `Abdullah bin Buhaina: Allah's Apostle once led us in a prayer and offered two rak`at and got up (for the third rak`a) without sitting (after the second rak`a). The people also got up with him, and when he was about to finish his prayer, we waited for him to finish the prayer with Taslim but he said Takbir before Taslim and performed two prostrations while sitting and then finished the prayer with Taslim.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).