Sahih Muslim · Hadith 1297
The Book of Mosques and Places of Prayer - كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
حدثنا يحيى بن يحيى، قال قرأت على مالك عن ابن شهاب، عن عبد الرحمن الأعرج، عن عبد الله ابن بحينة، 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 فسجد سجدتين وهو جالس قبل التسليم ثم سلم .
'Abdullah b. Buhaina reported: The Messenger of Allah (may peace be upon him) led us two rak'ahs of prayer in one of the (obligatory) prayers and then got up and did not sit. and the people stood up along with him. When he finished the prayer and we expected him to pronounce salutation. he said:" Allah is Most Great" while sitting and made two prostrations before salutation and then pronounced (the, final) salutation.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).