Sahih Muslim Book 4, Hadith Number 783.

Chapter : The reciting of al-Fatiha in every Rakah of prayer is obligatory.

lmran b. Husain reported: The Messenger of Allah (may peace be upon him) led us In Zuhr or ‘Asr prayer (noon or the afternoon prayer). (On concluding it) he said: Who recited behind me (the verses): Sabbih Isma Rabbik al-Ala (Glorify the name of thy Lord, the Most High)? There upon a person said: It was I, but I intended nothing but goodness. I felt that some one of you was disputing with me in it (or he was taking out from my tongue what I was reciting), said the Holy Prophet (may peace be upon him).