Sahih Bukhari
Actions while Praying
Volume: 002 / Book Number: 022 / Hadith Number: 316
Narrated 'Abdullah bin Buhaina :
Allah's Apostle got up after the second Raka of the Zuhr prayer without sitting in between (the second and the third Rakat). When he finished the prayer he performed two prostrations (of Sahu) and then finished the prayer with Tasllm.