Sahih Bukhari | Volume 1 | Hadith Number 739

Narrated by 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.