Allah's Messenger (ﷺ) 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.
Sahih al-Bukhari 1224 Book 22, Hadith 1
USC-MSA Vol. 2, Book 22, Hadith 315
Allah's Messenger (ﷺ) got up after the second rak`a of the Zuhr prayer without sitting in between (the second and the third rak`at). When he finished the prayer he performed two prostrations (of Sahu) and then finished the prayer with Taslim.
Sahih al-Bukhari 1225 Book 22, Hadith 2
USC-MSA web Vol. 2, Book 22, Hadith 316