Sahih Bukhari
Characteristics of Prayer
Volume: 001 / Book Number: 012 / Hadith Number: 739
Narrated Abu Huraira:
The Qur'an is recited in every prayer and in those prayers in which Allah's Apostle recited aloud for us, we recite aloud in the same prayers for you; and the prayers in which the Prophet recited quietly, we recite quietly. If you recite "Al-Fatiha" only it is sufficient but if you recite something else in addition, it is better.