Allah`s Messenger (sa) said, `Whoever does not recite Surat Al-Fatiha (the first Surah of the Qur`an) in this Salat (prayer), his Salat (prayer) is invalid.` ...
Allah`s Messenger (sa) said, `Whoever does not recite Surat Al-Fatiha (the first Surah of the Qur`an) in this Salat (prayer), his Salat (prayer) is invalid.` [Bukhari]