Narrated Abu Salama: Abu Hurairah said, "No doubt, my Salat is similar to that of the Prophet (saws)." Abu Hurairah used to recite Qunut after saying Sami' Allahu liman hamida in the last Rak'a of the Zuhr, Isha and Fajr Prayers. He would ask Allah's Forgiveness for the true believers and curse the disbelievers.

Narrated Anas: The qunut [supplication before going down for prostration] used to be recited in the Maghrib and the Fajr prayers.

Narrated Rifa`a bin Rafi Az-Zuraqi: One day we were praying behind the Prophet. When he raised his head from bowing, he said, "Sami`a l-lahu liman hamidah." A man behind him said, "Rabbana wa laka l-hamdu, hamdan kathiran taiyiban mubarakan fihi" (O our Lord! All the praises are for You, many good and blessed praises). When the Prophet completed the prayer, he asked, "Who has said these words?" The man replied, "I." The Prophet said, "I saw over thirty angels competing to write it first." Prophet rose (from bowing) and stood straight till all the vertebrae of his spinal column came to a natural position.