Bukhari :: Book 8 :: Volume 74 :: Hadith 281
Narrated Ibn Mas'ud:
Allah's Apostle taught me the Tashah-hud as he taught me a Sura from the Quran, while my hand was between his hands. (Tashah-hud was) all the best compliments and the prayers and the good things are for Allah. Peace and Allah's Mercy and Blessings be on you, O Prophet! Peace be on us and on the pious slaves of Allah, I testify that none has the right to be worshipped but Allah, and I also testify that Muhammad is Allah's slave and His Apostle. (We used to recite this in the prayer) during the lifetime of the Prophet , but when he had died, we used to say, "Peace be on the Prophet."
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